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data/mdn-content/files/en-us/web/api/deprecationreportbody | data/mdn-content/files/en-us/web/api/deprecationreportbody/id/index.md | ---
title: "DeprecationReportBody: id property"
short-title: id
slug: Web/API/DeprecationReportBody/id
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.DeprecationReportBody.id
---
{{APIRef("Reporting API")}}{{SeeCompatTable}}
The **`id`** read-only property of the {{domxref("DeprecationReportBody")}} interface returns a string representing the feature or API that is deprecated. This can be used to group or count related reports.
## Value
A string.
## Examples
In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then print the value of `id` to the console.
```js
let options = {
types: ["deprecation"],
buffered: true,
};
let observer = new ReportingObserver((reports, observer) => {
let firstReport = reports[0];
console.log(firstReport.type); // deprecation
console.log(firstReport.body.id);
}, options);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/deprecationreportbody | data/mdn-content/files/en-us/web/api/deprecationreportbody/anticipatedremoval/index.md | ---
title: "DeprecationReportBody: anticipatedRemoval property"
short-title: anticipatedRemoval
slug: Web/API/DeprecationReportBody/anticipatedRemoval
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.DeprecationReportBody.anticipatedRemoval
---
{{APIRef("Reporting API")}}{{SeeCompatTable}}
The **`anticipatedRemoval`** read-only property of the {{domxref("DeprecationReportBody")}} interface returns the date that the browser version which removes the feature will ship. This value can be used to prioritize warnings. If this property returns `null` because the date is unknown, then the deprecation should be considered low priority.
## Value
A {{jsxref("date")}} object, or `null` if the date is not known.
## Examples
In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then print the value of `anticipatedRemoval` to the console.
```js
let options = {
types: ["deprecation"],
buffered: true,
};
let observer = new ReportingObserver((reports, observer) => {
let firstReport = reports[0];
console.log(firstReport.type); // deprecation
console.log(firstReport.body.anticipatedRemoval);
}, options);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/deprecationreportbody | data/mdn-content/files/en-us/web/api/deprecationreportbody/tojson/index.md | ---
title: "DeprecationReportBody: toJSON() method"
short-title: toJSON()
slug: Web/API/DeprecationReportBody/toJSON
page-type: web-api-instance-method
status:
- experimental
browser-compat: api.DeprecationReportBody.toJSON
---
{{APIRef("Reporting API")}}{{SeeCompatTable}}
The **`toJSON()`** method of the {{domxref("DeprecationReportBody")}} interface is a _serializer_, and returns a JSON representation of the `InterventionReportBody` object.
## Syntax
```js-nolint
toJSON()
```
### Parameters
None.
### Return value
A JSON object that is the serialization of the {{domxref("DeprecationReportBody")}} object.
## Examples
In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then return a JSON representation of the first entry.
```js
let options = {
types: ["deprecation"],
buffered: true,
};
let observer = new ReportingObserver((reports, observer) => {
let firstReport = reports[0];
console.log(firstReport.toJSON());
}, options);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/deprecationreportbody | data/mdn-content/files/en-us/web/api/deprecationreportbody/sourcefile/index.md | ---
title: "DeprecationReportBody: sourceFile property"
short-title: sourceFile
slug: Web/API/DeprecationReportBody/sourceFile
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.DeprecationReportBody.sourceFile
---
{{APIRef("Reporting API")}}{{SeeCompatTable}}
The **`sourceFile`** read-only property of the {{domxref("DeprecationReportBody")}} interface returns the path to the source file where the deprecated feature was used.
> **Note:** This property can be used with {{domxref("DeprecationReportBody.lineNumber")}} and {{domxref("DeprecationReportBody.columnNumber")}} to locate the column and line in the file where the error occurred.
## Value
A string, or `null` if the path is not known.
## Examples
In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then print the value of `sourceFile` to the console.
```js
let options = {
types: ["deprecation"],
buffered: true,
};
let observer = new ReportingObserver((reports, observer) => {
let firstReport = reports[0];
console.log(firstReport.type); // deprecation
console.log(firstReport.body.sourceFile);
}, options);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/webgl_depth_texture/index.md | ---
title: WEBGL_depth_texture extension
short-title: WEBGL_depth_texture
slug: Web/API/WEBGL_depth_texture
page-type: webgl-extension
browser-compat: api.WEBGL_depth_texture
---
{{APIRef("WebGL")}}
The **`WEBGL_depth_texture`** extension is part of the [WebGL API](/en-US/docs/Web/API/WebGL_API) and defines 2D depth and depth-stencil textures.
WebGL extensions are available using the {{domxref("WebGLRenderingContext.getExtension()")}} method. For more information, see also [Using Extensions](/en-US/docs/Web/API/WebGL_API/Using_Extensions) in the [WebGL tutorial](/en-US/docs/Web/API/WebGL_API/Tutorial).
> **Note:** This extension is only available to {{domxref("WebGLRenderingContext", "WebGL1", "", 1)}} contexts. In {{domxref("WebGL2RenderingContext", "WebGL2", "", 1)}}, the functionality of this extension is available on the WebGL2 context by default. The constant in WebGL2 is `gl.UNSIGNED_INT_24_8`.
## Constants
This extension adds a new constant:
- `ext.UNSIGNED_INT_24_8_WEBGL`
- : Unsigned integer type for 24-bit depth texture data.
## Extended methods
This extension extends {{domxref("WebGLRenderingContext.texImage2D()")}}:
- The `format` and `internalformat` parameters now accept `gl.DEPTH_COMPONENT` and `gl.DEPTH_STENCIL`.
- The `type` parameter now accepts `gl.UNSIGNED_SHORT`, `gl.UNSIGNED_INT`, and `ext.UNSIGNED_INT_24_8_WEBGL`.
- The `pixels` parameter now accepts a {{jsxref("Uint16Array")}} or a {{jsxref("Uint32Array")}} object.
This extension extends {{domxref("WebGLRenderingContext.framebufferTexture2D()")}}:
- The `attachment` parameter now accepts `gl.DEPTH_STENCIL_ATTACHMENT`.
> **Note:** Incorrectly stated as the `target` parameter in the specification, see <https://www.khronos.org/bugzilla/show_bug.cgi?id=674>.
## Examples
```js
const ext = gl.getExtension("WEBGL_depth_texture");
gl.texImage2D(
gl.TEXTURE_2D,
0,
gl.DEPTH_COMPONENT,
512,
512,
0,
gl.DEPTH_COMPONENT,
gl.UNSIGNED_SHORT,
null,
);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGLRenderingContext.getExtension()")}}
- {{domxref("WebGLRenderingContext.texImage2D()")}}
- {{domxref("WebGLRenderingContext.framebufferTexture2D()")}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/web_midi_api/index.md | ---
title: Web MIDI API
slug: Web/API/Web_MIDI_API
page-type: web-api-overview
browser-compat:
- api.Navigator.requestMIDIAccess
- http.headers.Permissions-Policy.midi
- api.Permissions.permission_midi
spec-urls: https://webaudio.github.io/web-midi-api/
---
{{DefaultAPISidebar("Web MIDI API")}}{{SecureContext_Header}}
The Web MIDI API connects to and interacts with Musical Instrument Digital Interface (MIDI) Devices.
The interfaces deal with the practical aspects of sending and receiving MIDI messages.
Therefore, the API can be used for musical and non-musical uses, with any MIDI device connected to your computer.
## Interfaces
- {{domxref("MIDIInputMap")}}
- : Represents all of the available MIDI input ports.
- {{domxref("MIDIOutputMap")}}
- : Represents all of the available MIDI output ports.
- {{domxref("MIDIAccess")}}
- : Provides the methods to list input and output devices, and to access an individual device.
- {{domxref("MIDIPort")}}
- : Represents an individual MIDI port.
- {{domxref("MIDIInput")}}
- : Provides a method for dealing with MIDI messages from an input port.
- {{domxref("MIDIOutput")}}
- : Queues messages to the linked MIDI port. Messages can be sent immediately or after a specified delay.
- {{domxref("MIDIMessageEvent")}}
- : The event passed to {{domxref("MIDIInput.midimessage_event")}}.
- {{domxref("MIDIConnectionEvent")}}
- : The event passed to the {{domxref("MIDIAccess.statechange_event")}} and {{domxref("MIDIPort.statechange_event")}} events, when a port becomes available or unavailable.
## Security requirements
Access to the API is requested using the {{domxref("navigator.requestMIDIAccess()")}} method.
- The method must be called in a [secure context](/en-US/docs/Web/Security/Secure_Contexts).
- Access may be gated by the [`midi`](/en-US/docs/Web/HTTP/Headers/Permissions-Policy/midi) HTTP [Permission Policy](/en-US/docs/Web/HTTP/Permissions_Policy).
- The user must explicitly grant permission to use the API through a user-agent specific mechanism, or have previously granted permission.
Note that if access is denied by a permission policy it cannot be granted by a user permission.
The permission status can be queried using the [Permissions API](/en-US/docs/Web/API/Permissions_API) method [`navigator.permissions.query()`](/en-US/docs/Web/API/Permissions/query), passing a permission descriptor with the `midi` permission and (optional) `sysex` property:
```js
navigator.permissions.query({ name: "midi", sysex: true }).then((result) => {
if (result.state === "granted") {
// Access granted.
} else if (result.state === "prompt") {
// Using API will prompt for permission
}
// Permission was denied by user prompt or permission policy
});
```
## Examples
### Gaining access to the MIDI port
The {{domxref("navigator.requestMIDIAccess()")}} method returns a promise that resolves to a {{domxref("MIDIAccess")}} object, which can then be used to access a MIDI device.
The method must be called in a secure context.
```js
let midi = null; // global MIDIAccess object
function onMIDISuccess(midiAccess) {
console.log("MIDI ready!");
midi = midiAccess; // store in the global (in real usage, would probably keep in an object instance)
}
function onMIDIFailure(msg) {
console.error(`Failed to get MIDI access - ${msg}`);
}
navigator.requestMIDIAccess().then(onMIDISuccess, onMIDIFailure);
```
### Listing inputs and outputs
In this example the list of input and output ports are retrieved and printed to the console.
```js
function listInputsAndOutputs(midiAccess) {
for (const entry of midiAccess.inputs) {
const input = entry[1];
console.log(
`Input port [type:'${input.type}']` +
` id:'${input.id}'` +
` manufacturer:'${input.manufacturer}'` +
` name:'${input.name}'` +
` version:'${input.version}'`,
);
}
for (const entry of midiAccess.outputs) {
const output = entry[1];
console.log(
`Output port [type:'${output.type}'] id:'${output.id}' manufacturer:'${output.manufacturer}' name:'${output.name}' version:'${output.version}'`,
);
}
}
```
### Handling MIDI Input
This example prints all MIDI input messages to the console.
```js
function onMIDIMessage(event) {
let str = `MIDI message received at timestamp ${event.timeStamp}[${event.data.length} bytes]: `;
for (const character of event.data) {
str += `0x${character.toString(16)} `;
}
console.log(str);
}
function startLoggingMIDIInput(midiAccess) {
midiAccess.inputs.forEach((entry) => {
entry.onmidimessage = onMIDIMessage;
});
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Introduction to Web MIDI](https://code.tutsplus.com/tutorials/introduction-to-web-midi--cms-25220)
- [Making Music in the Browser](https://www.keithmcmillen.com/blog/making-music-in-the-browser-web-midi-api/)
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/svgangle/index.md | ---
title: SVGAngle
slug: Web/API/SVGAngle
page-type: web-api-interface
browser-compat: api.SVGAngle
---
{{APIRef("SVG")}}
The `SVGAngle` interface is used to represent a value that can be an {{cssxref("<angle>")}} or {{cssxref("<number>")}} value. An `SVGAngle` reflected through the {{SVGAttr("animVal")}} attribute is always read only.
An `SVGAngle` object can be designated as read only, which means that attempts to modify the object will result in an exception being thrown.
An `SVGAngle` object can be associated with a particular element. The associated element is used to determine which element's content attribute to update if the object reflects an attribute. Unless otherwise described, an `SVGAngle` object is not associated with any element.
Every `SVGAngle` object operates in one of two modes:
1. **_Reflect the base value_** of a reflected animatable attribute (being exposed through the {{SVGAttr("baseVal")}} member of an {{domxref("SVGAnimatedAngle")}}),
2. **_Be detached_,** which is the case for `SVGAngle` objects created with {{domxref("SVGSVGElement.createSVGAngle()")}}.
## Constants
- `SVG_ANGLETYPE_UNKNOWN`
- : Some unknown type of value.
- `SVG_ANGLETYPE_UNSPECIFIED`
- : A unitless {{cssxref("<number>")}} interpreted as a value in degrees.
- `SVG_ANGLETYPE_DEG`
- : An {{cssxref("<angle>")}} with a `deg` unit.
- `SVG_ANGLETYPE_RAD`
- : An {{cssxref("<angle>")}} with a `rad` unit.
- `SVG_ANGLETYPE_GRAD`
- : An {{cssxref("<angle>")}} with a `grad` unit.
## Instance properties
- `unitType`
- : The type of the value as specified by one of the `SVG_ANGLETYPE_*` constants defined on this interface.
- `value`
- : The value as a floating point value, in user units. Setting this attribute will cause `valueInSpecifiedUnits` and `valueAsString` to be updated automatically to reflect this setting.
**Exceptions on setting:** A {{domxref("DOMException")}} with code `NO_MODIFICATION_ALLOWED_ERR` is raised when the length corresponds to a read-only attribute, or when the object itself is read-only.
- `valueInSpecifiedUnits`
- : The value as a floating point value, in the units expressed by `unitType`. Setting this attribute will cause `value` and `valueAsString` to be updated automatically to reflect this setting.
**Exceptions on setting:** A {{domxref("DOMException")}} with code `NO_MODIFICATION_ALLOWED_ERR` is raised when the length corresponds to a read-only attribute, or when the object itself is read-only.
- `valueAsString`
- : The value as a string value, in the units expressed by `unitType`. Setting this attribute will cause `value`, `valueInSpecifiedUnits`, and `unitType` to be updated automatically to reflect this setting.
**Exceptions on setting:**
A {{domxref("DOMException")}} with code `SYNTAX_ERR` is raised if the assigned string cannot be parsed as a valid {{cssxref("<angle>")}}.
A {{domxref("DOMException")}} with code `NO_MODIFICATION_ALLOWED_ERR` is raised when the length corresponds to a read-only attribute, or when the object itself is read-only.
## Instance methods
- `newValueSpecifiedUnits`
- : Reset the value as a number with an associated unitType, thereby replacing the values for all of the attributes on the object.
**Exceptions:**
- A {{domxref("DOMException")}} with code `NOT_SUPPORTED_ERR` is raised if `unitType` is `SVG_ANGLETYPE_UNKNOWN` or not a valid unit type constant (one of the other `SVG_ANGLETYPE_*` constants defined on this interface).
- A {{domxref("DOMException")}} with code `NO_MODIFICATION_ALLOWED_ERR` is raised when the length corresponds to a read only attribute or when the object itself is read only.
- `convertToSpecifiedUnits`
- : Preserve the same underlying stored value, but reset the stored unit identifier to the given `unitType`. Object attributes `unitType`, `valueInSpecifiedUnits`, and `valueAsString` might be modified as a result of this method.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/hid/index.md | ---
title: HID
slug: Web/API/HID
page-type: web-api-interface
status:
- experimental
browser-compat: api.HID
---
{{securecontext_header}}{{APIRef("WebHID API")}}{{SeeCompatTable}}
The **`HID`** interface provides methods for connecting to _HID devices_, listing attached HID devices and event handlers for connected HID devices.
{{InheritanceDiagram}}
## Instance properties
_This interface also inherits properties of its parent, {{domxref("EventTarget")}}._
## Instance methods
_This interface also inherits methods of its parent, {{domxref("EventTarget")}}._
- {{domxref("HID.getDevices","getDevices()")}} {{Experimental_Inline}}
- : Returns a {{jsxref("Promise")}} that resolves with an array of connected {{domxref("HIDDevice")}} objects.
- {{domxref("HID.requestDevice","requestDevice()")}} {{Experimental_Inline}}
- : Returns a {{jsxref("Promise")}} that resolves with an array of connected {{domxref("HIDDevice")}} objects. Calling this function will trigger the user agent's permission flow in order to gain permission to access one selected device from the returned list of devices.
### Events
- {{domxref("HID.connect_event", "connect")}} {{Experimental_Inline}}
- : Fired when an HID device is connected.
- {{domxref("HID.disconnect_event", "disconnect")}} {{Experimental_Inline}}
- : Fired when an HID device is disconnected.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebHID API")}}
| 0 |
data/mdn-content/files/en-us/web/api/hid | data/mdn-content/files/en-us/web/api/hid/disconnect_event/index.md | ---
title: "HID: disconnect event"
short-title: disconnect
slug: Web/API/HID/disconnect_event
page-type: web-api-event
status:
- experimental
browser-compat: api.HID.disconnect_event
---
{{securecontext_header}}{{APIRef("WebHID API")}}{{SeeCompatTable}}
The **`disconnect`** event of the {{domxref("HID")}} interface fires when the user agent disconnects a HID device.
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("disconnect", (event) => {});
ondisconnect = (event) => {};
```
## Event type
A {{domxref("HIDConnectionEvent")}}. Inherits from {{domxref("Event")}}.
{{InheritanceDiagram("HIDConnectionEvent")}}
## Event properties
_In addition to the properties listed below, properties from the parent interface, {{domxref("Event")}}, are available._
- {{domxref("HIDConnectionEvent.device", "device")}} {{ReadOnlyInline}}
- : The {{domxref("HIDDevice")}} the event is fired for.
## Examples
In the following example an event listener is registered to listen for the disconnection of a device. The name of the device is then printed to the console using {{domxref("HIDDevice.productName")}}.
```js
navigator.hid.addEventListener("disconnect", ({ device }) => {
console.log(`HID disconnected: ${device.productName}`);
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/hid | data/mdn-content/files/en-us/web/api/hid/requestdevice/index.md | ---
title: "HID: requestDevice() method"
short-title: requestDevice()
slug: Web/API/HID/requestDevice
page-type: web-api-instance-method
status:
- experimental
browser-compat: api.HID.requestDevice
---
{{securecontext_header}}{{APIRef("WebHID API")}}{{SeeCompatTable}}
The **`requestDevice()`** method of the {{domxref("HID")}} interface requests access to a HID device.
The user agent will present a permission dialog including a list of connected devices, and ask the user to select and grant permission to one of these devices.
## Syntax
```js-nolint
requestDevice(options)
```
### Parameters
- `options`
- : An object containing an array of filter objects for possible devices to pair with. Each filter object can have the following properties:
- `vendorId` {{optional_inline}}
- : An integer representing the vendorId of the requested HID device
- `productId` {{optional_inline}}
- : An integer representing the productId of the requested HID device.
- `usagePage` {{optional_inline}}
- : An integer representing the usage page component of the HID usage of the requested device. The usage for a top level collection is used to identify the device type.
Standard HID usage values can be found in the [HID Usage Tables](https://usb.org/document-library/hid-usage-tables-13) document
- `usage` {{optional_inline}}
- : An integer representing the usage ID component of the HID usage of the requested device.
> **Note:** The device filters are used to narrow the list of devices presented to the user. If no filters are present, all connected devices are shown. When one or more filters are included, a device is included if any filter matches. To match a filter, all of the rules included in that filter must match.
### Return value
A {{jsxref("Promise")}} that resolves with an array of connected {{domxref("HIDDevice")}} objects that match the filters passed in.
### Exceptions
- `SecurityError` {{domxref("DOMException")}}
- : Thrown if the page does not allow access to the HID feature.
## Security
[Transient user activation](/en-US/docs/Web/Security/User_activation) is required. The user has to interact with the page or a UI element in order for this feature to work.
## Examples
### Matching a device with all four filter rules
In the following example a HID device is requested that has a vendor ID of `0xABCD`, product ID of `0x1234`, usage page `0x0C` and usage ID `0x01`. Only devices that match all of these rules will be shown.
```js
let requestButton = document.getElementById("request-hid-device");
requestButton.addEventListener("click", async () => {
let device;
try {
const devices = await navigator.hid.requestDevice({
filters: [
{
vendorId: 0xabcd,
productId: 0x1234,
usagePage: 0x0c,
usage: 0x01,
},
],
});
device = devices[0];
} catch (error) {
console.log("An error occurred.");
}
if (!device) {
console.log("No device was selected.");
} else {
console.log(`HID: ${device.productName}`);
}
});
```
### An example with two filters
This next example includes two filters. Devices will be shown if they match either of these filters.
```js
// Filter on devices with the Nintendo Switch Joy-Con USB Vendor/Product IDs.
const filters = [
{
vendorId: 0x057e, // Nintendo Co., Ltd
productId: 0x2006, // Joy-Con Left
},
{
vendorId: 0x057e, // Nintendo Co., Ltd
productId: 0x2007, // Joy-Con Right
},
];
// Prompt user to select a Joy-Con device.
const [device] = await navigator.hid.requestDevice({ filters });
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/hid | data/mdn-content/files/en-us/web/api/hid/connect_event/index.md | ---
title: "HID: connect event"
short-title: connect
slug: Web/API/HID/connect_event
page-type: web-api-event
status:
- experimental
browser-compat: api.HID.connect_event
---
{{securecontext_header}}{{APIRef("WebHID API")}}{{SeeCompatTable}}
The **`connect`** event of the {{domxref("HID")}} interface fires when the user agent connects to a HID device.
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("connect", (event) => {});
onconnect = (event) => {};
```
## Event type
A {{domxref("HIDConnectionEvent")}}. Inherits from {{domxref("Event")}}.
{{InheritanceDiagram("HIDConnectionEvent")}}
## Event properties
_In addition to the properties listed below, properties from the parent interface, {{domxref("Event")}}, are available._
- {{domxref("HIDConnectionEvent.device", "device")}} {{ReadOnlyInline}}
- : The {{domxref("HIDDevice")}} the event is fired for.
## Examples
In the following example an event listener is registered to listen for the connection of a device. The name of the device is then printed to the console using {{domxref("HIDDevice.productName")}}.
```js
navigator.hid.addEventListener("connect", ({ device }) => {
console.log(`HID connected: ${device.productName}`);
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/hid | data/mdn-content/files/en-us/web/api/hid/getdevices/index.md | ---
title: "HID: getDevices() method"
short-title: getDevices()
slug: Web/API/HID/getDevices
page-type: web-api-instance-method
status:
- experimental
browser-compat: api.HID.getDevices
---
{{securecontext_header}}{{APIRef("WebHID API")}}{{SeeCompatTable}}
The **`getDevices()`** method of the {{domxref("HID")}} interface gets a list of the connected HID devices that the user has previously been granted access to in response to a {{domxref("HID.requestDevice","requestDevice()")}} call.
## Syntax
```js-nolint
getDevices()
```
### Parameters
None.
### Return value
A {{jsxref("Promise")}} that resolves with a list of {{domxref("HIDDevice")}} objects.
## Examples
The following example gets a list of devices and logs the device names to the console.
```js
document.addEventListener("DOMContentLoaded", async () => {
let devices = await navigator.hid.getDevices();
devices.forEach((device) => {
console.log(`HID: ${device.productName}`);
});
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/svgtransform/index.md | ---
title: SVGTransform
slug: Web/API/SVGTransform
page-type: web-api-interface
browser-compat: api.SVGTransform
---
{{APIRef("SVG")}}
## SVG transform interface
`SVGTransform` is the interface for one of the component transformations within an {{ domxref("SVGTransformList") }}; thus, an `SVGTransform` object corresponds to a single component (e.g., `scale(…)` or `matrix(…)`) within a {{ SVGAttr("transform") }} attribute.
An `SVGTransform` object can be designated as read only, which means that attempts to modify the object will result in an exception being thrown.
### Interface overview
<table class="no-markdown">
<tbody>
<tr>
<th scope="row">Also implement</th>
<td><em>None</em></td>
</tr>
<tr>
<th scope="row">Methods</th>
<td>
<ul>
<li>
<code
>void setMatrix(in {{ domxref("DOMMatrix") }}
matrix)</code
>
</li>
<li><code>void setTranslate(in float tx, in float ty)</code></li>
<li><code>void setScale(in float sx, in float sy)</code></li>
<li>
<code
>void setRotate(in float angle, in float cx, in float cy)</code
>
</li>
<li><code>void setSkewX(in float angle)</code></li>
<li><code>void setSkewY(in float angle)</code></li>
</ul>
</td>
</tr>
<tr>
<th scope="row">Properties</th>
<td>
<ul>
<li>readonly unsigned short <code>type</code></li>
<li>readonly float <code>angle</code></li>
<li>
readonly {{ domxref("DOMMatrix") }} <code>matrix</code>
</li>
</ul>
</td>
</tr>
<tr>
<th scope="row">Constants</th>
<td>
<ul>
<li><code>SVG_TRANSFORM_UNKNOWN</code> = 0</li>
<li><code>SVG_TRANSFORM_MATRIX</code> = 1</li>
<li><code>SVG_TRANSFORM_TRANSLATE</code> = 2</li>
<li><code>SVG_TRANSFORM_SCALE</code> = 3</li>
<li><code>SVG_TRANSFORM_ROTATE</code> = 4</li>
<li><code>SVG_TRANSFORM_SKEWX</code> = 5</li>
<li><code>SVG_TRANSFORM_SKEWY</code> = 6</li>
</ul>
</td>
</tr>
<tr>
<th scope="row">Normative document</th>
<td>
<a href="https://www.w3.org/TR/SVG11/coords.html#InterfaceSVGTransform"
>SVG 1.1 (2nd Edition)</a
>
</td>
</tr>
</tbody>
</table>
## Constants
<table class="no-markdown">
<tbody>
<tr>
<th>Name</th>
<th>Value</th>
<th>Description</th>
</tr>
<tr>
<td><code>SVG_TRANSFORM_UNKNOWN</code></td>
<td>0</td>
<td>
The unit type is not one of predefined unit types. It is invalid to
attempt to define a new value of this type or to attempt to switch an
existing value to this type.
</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_MATRIX</code></td>
<td>1</td>
<td>A <code>matrix(…)</code> transformation</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_TRANSLATE</code></td>
<td>2</td>
<td>A <code>translate(…)</code> transformation</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_SCALE</code></td>
<td>3</td>
<td>A <code>scale(…)</code> transformation</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_ROTATE</code></td>
<td>4</td>
<td>A <code>rotate(…)</code> transformation</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_SKEWX</code></td>
<td>5</td>
<td>A <code>skewx(…)</code> transformation</td>
</tr>
<tr>
<td><code>SVG_TRANSFORM_SKEWY</code></td>
<td>6</td>
<td>A <code>skewy(…)</code> transformation</td>
</tr>
</tbody>
</table>
## Instance properties
<table class="no-markdown">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>type</code></td>
<td>unsigned short</td>
<td>
The type of the value as specified by one of the SVG_TRANSFORM_*
constants defined on this interface.
</td>
</tr>
<tr>
<td><code>angle</code></td>
<td>float</td>
<td>
A convenience attribute for <code>SVG_TRANSFORM_ROTATE</code>,
<code>SVG_TRANSFORM_SKEWX</code> and <code>SVG_TRANSFORM_SKEWY</code>.
It holds the angle that was specified.<br /><br />For
<code>SVG_TRANSFORM_MATRIX</code>,
<code>SVG_TRANSFORM_TRANSLATE</code> and
<code>SVG_TRANSFORM_SCALE</code>, <code>angle</code> will be zero.
</td>
</tr>
<tr>
<td><code>matrix</code></td>
<td>{{ domxref("DOMMatrix") }}</td>
<td>
<p>
The matrix that represents this transformation. The matrix object is
live, meaning that any changes made to the
<code>SVGTransform</code> object are immediately reflected in the
matrix object and vice versa. In case the matrix object is changed
directly (i.e., without using the methods on the
<code>SVGTransform</code> interface itself) then the type of the
<code>SVGTransform</code> changes to
<code>SVG_TRANSFORM_MATRIX</code>.
</p>
<ul>
<li>
For <code>SVG_TRANSFORM_MATRIX</code>, the matrix contains the a, b,
c, d, e, f values supplied by the user.
</li>
<li>
For <code>SVG_TRANSFORM_TRANSLATE</code>, e and f represent the
translation amounts (a=1, b=0, c=0 and d=1).
</li>
<li>
For <code>SVG_TRANSFORM_SCALE</code>, a and d represent the scale
amounts (b=0, c=0, e=0 and f=0).
</li>
<li>
For <code>SVG_TRANSFORM_SKEWX</code> and
<code>SVG_TRANSFORM_SKEWY</code>, a, b, c and d represent the matrix
which will result in the given skew (e=0 and f=0).
</li>
<li>
For <code>SVG_TRANSFORM_ROTATE</code>, a, b, c, d, e and f together
represent the matrix which will result in the given rotation. When
the rotation is around the center point (0, 0), e and f will be
zero.
</li>
</ul>
</td>
</tr>
</tbody>
</table>
## Instance methods
<table class="no-markdown">
<thead>
<tr>
<th>Name & Arguments</th>
<th>Return</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<code
><strong>setMatrix</strong>(in {{ domxref("DOMMatrix") }}
<em>matrix</em>)</code
>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_MATRIX</code>, with
parameter matrix defining the new transformation. Note that the values
from the parameter <code>matrix</code> are copied.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
<tr>
<td>
<code
><strong>setTranslate</strong>(in float <em>tx</em> , in float
<em>ty</em>)</code
>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_TRANSLATE</code>, with
parameters <code>tx</code> and <code>ty</code> defining the
translation amounts.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
<tr>
<td>
<code
><strong>setScale</strong>(in float <em>sx</em> , in float
<em>sy</em>)</code
>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_SCALE</code>, with
parameters <code>sx</code> and <code>sy</code> defining the scale
amounts.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
<tr>
<td>
<code
><strong>setRotate</strong>(in float <em>angle</em>, in float
<em>cx</em> , in float <em>cy</em>)</code
>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_ROTATE</code>, with
parameter <code>angle</code> defining the rotation angle and
parameters <code>cx</code> and <code>cy</code> defining the optional
center of rotation.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
<tr>
<td>
<code><strong>setSkewX</strong>(in float <em>angle</em>)</code>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_SKEWX</code>, with
parameter <code>angle</code> defining the amount of skew.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
<tr>
<td>
<code><strong>setSkewY</strong>(in float <em>angle</em>)</code>
</td>
<td><em>void</em></td>
<td>
<p>
Sets the transform type to <code>SVG_TRANSFORM_SKEWY</code>, with
parameter <code>angle</code> defining the amount of skew.
</p>
<p><strong>Exceptions:</strong></p>
<ul>
<li>
a {{ domxref("DOMException") }} with code
<code>NO_MODIFICATION_ALLOWED_ERR</code> is raised when attempting
to modify a read only attribute or when the object itself is read
only.
</li>
</ul>
</td>
</tr>
</tbody>
</table>
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/prioritized_task_scheduling_api/index.md | ---
title: Prioritized Task Scheduling API
slug: Web/API/Prioritized_Task_Scheduling_API
page-type: web-api-overview
browser-compat:
- api.Scheduler
- api.Scheduling
---
{{DefaultAPISidebar("Prioritized Task Scheduling API")}} {{AvailableInWorkers}}
The **Prioritized Task Scheduling API** provides a standardized way to prioritize all tasks belonging to an application, whether they are defined in a website developer's code or in third-party libraries and frameworks.
The [task priorities](#task_priorities) are very coarse-grained and based around whether tasks block user interaction or otherwise impact the user experience, or can run in the background. Developers and frameworks may implement more fine-grained prioritization schemes within the broad categories defined by the API.
The API is promise-based and supports the ability to set and change task priorities, to delay tasks being added to the scheduler, to abort tasks, and to monitor for priority change and abort events.
In this page, we also include information about the {{domxref("Scheduling.isInputPending", "navigator.scheduling.isInputPending()")}} method, which was defined in a different API specification but is very closely related to task scheduling. This method allows you to check whether there are pending input events in the event queue, and therefore handle task queues efficiently, only yielding to the main thread when it is needed.
## Concepts and usage
### Prioritized task scheduling
The Prioritized Task Scheduling API is available in both window and worker threads using the `scheduler` property on the global object.
The main API method is {{domxref('Scheduler.postTask()')}}, which takes a callback function ("the task") and returns a promise that resolves with the return value of the function, or rejects with an error.
The simplest form of the API is shown below. This creates a task with default priority [`user-visible`](#user-visible) that has a fixed priority and cannot be aborted.
```js
const promise = scheduler.postTask(myTask);
```
Because the method returns a promise you can wait on its resolution asynchronously using `then`, and catch errors thrown by the task callback function (or when the task is aborted) using `catch`. The callback function can be any kind of function (below we demonstrate an arrow function).
```js
scheduler
.postTask(() => "Task executing")
// Promise resolved: log task result when promise resolves
.then((taskResult) => console.log(`${taskResult}`))
// Promise rejected: log AbortError or errors thrown by task
.catch((error) => console.error(`Error: ${error}`));
```
The same task might be waited on using `await`/`async` as shown below (note, this is run in an [Immediately Invoked Function Expression (IIFE)](/en-US/docs/Glossary/IIFE)):
```js
(async () => {
try {
const result = await scheduler.postTask(() => "Task executing");
console.log(result);
} catch (error) {
// Log AbortError or error thrown in task function
console.error(`Error: ${error}`);
}
})();
```
You can also specify an options object to the `postTask()` method if you want to change the default behavior.
The options are:
- `priority` This allows you to specify a particular immutable priority.
Once set, the priority cannot be changed.
- `signal` This allows you to specify a signal, which may be either a {{domxref("TaskSignal")}} or {{domxref("AbortSignal")}}
The signal is associated with a controller, which can be used to abort the task.
A {{domxref("TaskSignal")}} can also be used to set and change the task priority if the [task is mutable](#mutable_and_immutable_task_priority).
- `delay` This allows you to specify the delay before the task is added for scheduling, in milliseconds.
The same example as above with a priority option would look like this:
```js
scheduler
.postTask(() => "Task executing", { priority: "user-blocking" })
.then((taskResult) => console.log(`${taskResult}`)) // Log the task result
.catch((error) => console.error(`Error: ${error}`)); // Log any errors
```
#### Task priorities
Scheduled tasks are run in priority order, followed by the order that they were added to the scheduler queue.
There are just three priorities, which are listed below (ordered from highest to lowest):
- `user-blocking`
- : Tasks that stop users from interacting with the page.
This includes rendering the page to the point where it can be used, or responding to user input.
- `user-visible`
- : Tasks that are visible to the user but not necessarily blocking user actions.
This might include rendering non-essential parts of the page, such as non-essential images or animations.
This is the default priority.
- `background`
- : Tasks that are not time-critical.
This might include log processing or initializing third party libraries that aren't required for rendering.
#### Mutable and immutable task priority
There are many use cases where the task priority never needs to change, while for others it does.
For example fetching an image might change from a `background` task to `user-visible` as a carousel is scrolled into the viewing area.
Task priorities can be set as static (immutable) or dynamic (modifiable) depending on the arguments passed to {{domxref('Scheduler.postTask()')}}.
Task priority is immutable if a value is specified in the `options.priority` argument.
The given value will be used for the task priority and cannot be changed.
The priority is modifiable only if a {{domxref("TaskSignal")}} is passed to the `options.signal` argument **and** `options.priority` is **not set**.
In this case the task will take its initial priority from the `signal` priority, and the priority can subsequently be changed by calling {{domxref("TaskController.setPriority()")}} on the controller associated with the signal.
If the priority is not set with `options.priority` or by passing a {{domxref("TaskSignal")}} to `options.signal` then it defaults to `user-visible` (and is by definition immutable).
Note that a task that needs to be aborted must set `options.signal` to either {{domxref("TaskSignal")}} or {{domxref("AbortSignal")}}.
However for a task with an immutable priority, {{domxref("AbortSignal")}} more clearly indicates that the task priority cannot be changed using the signal.
### isInputPending()
The {{domxref("Scheduling.isInputPending", "isInputPending()")}} API is intended to help with task execution, enabling you to make task runners more efficient by yielding to the main thread only when the user is trying to interact with your app, rather than having to do it at arbitrary intervals.
Let's run through an example to demonstrate what we mean by this. When you have several tasks that are of roughly the same priority, it makes sense to break them down into separate functions to aid with maintenance, debugging, and many other reasons.
For example:
```js
function main() {
a();
b();
c();
d();
e();
}
```
However, this kind of structure doesn't help with main thread blocking. Since all five of the tasks are being run inside one main function, the browser runs them all as a single task.
To handle this, we tend to run a function periodically to get the code to _yield to the main thread_. This means that our code is split into multiple tasks, between the execution of which the browser is given the opportunity to handle high-priority tasks such as updating the UI. A common pattern for this function uses {{domxref("setTimeout()")}} to postpone execution into a separate task:
```js
function yield() {
return new Promise((resolve) => {
setTimeout(resolve, 0);
});
}
```
This can be used inside a task runner pattern like so, to yield to the main thread after each task has been run:
```js
async function main() {
// Create an array of functions to run
const tasks = [a, b, c, d, e];
// Loop over the tasks
while (tasks.length > 0) {
// Shift the first task off the tasks array
const task = tasks.shift();
// Run the task
task();
// Yield to the main thread
await yield();
}
}
```
This helps with the main thread-blocking problem, but it could be better — we can use {{domxref("Scheduling.isInputPending", "navigator.scheduling.isInputPending()")}} to run the `yield()` function only when the user is attempting to interact with the page:
```js
async function main() {
// Create an array of functions to run
const tasks = [a, b, c, d, e];
while (tasks.length > 0) {
// Yield to a pending user input
if (navigator.scheduling.isInputPending()) {
await yield();
} else {
// Shift the first task off the tasks array
const task = tasks.shift();
// Run the task
task();
}
}
}
```
This allows you to avoid blocking the main thread when the user is actively interacting with the page, potentially providing a smoother user experience. However, by only yielding when necessary, we can continue running the current task when there are no user inputs to process. This also avoids tasks being placed at the back of the queue behind other non-essential browser-initiated tasks that were scheduled after the current one.
## Interfaces
- {{domxref("Scheduler")}}
- : Contains the {{domxref('Scheduler.postTask', 'postTask()')}} method for adding prioritized tasks to be scheduled.
An instance of this interface is available on the {{domxref("Window")}} or {{domxref("WorkerGlobalScope")}} global objects (`this.scheduler`).
- {{domxref("Scheduling")}}
- : Contains the {{domxref('Scheduling.isInputPending', 'isInputPending()')}} method for checking whether there are pending input events in the event queue.
- {{domxref("TaskController")}}
- : Supports both aborting a task and changing its priority.
- {{domxref("TaskSignal")}}
- : A signal object that allows you to abort a task and change its priority, if required, using a {{domxref("TaskController")}} object.
- {{domxref("TaskPriorityChangeEvent")}}
- : The interface for the {{domxref("TaskSignal/prioritychange_event","prioritychange")}} event, which is sent when the priority for a task is changed.
> **Note:** If the [task priority](#task_priorities) never needs to be changed, you can use an {{domxref("AbortController")}} and its associated {{domxref("AbortSignal")}} instead of {{domxref("TaskController")}} and {{domxref("TaskSignal")}}.
### Extensions to other interfaces
- [`Navigator.scheduling`](/en-US/docs/Web/API/Navigator/scheduling)
- : This property is the entry point for using the `Scheduling.isInputPending()` method.
- [`scheduler`](/en-US/docs/Web/API/scheduler_property)
- : This property is the entry point for using the `Scheduler.postTask()` method.
It is implemented on [`Window`](/en-US/docs/Web/API/Window#scheduler) and [`WorkerGlobalScope`](/en-US/docs/Web/API/WorkerGlobalScope#scheduler), making an instance of {{domxref("Scheduler")}} available through `this` in most scopes.
## Task scheduling examples
Note that the examples below use `mylog()` to write to a text area.
The code for the log area and method is generally hidden to not distract from more relevant code.
```html hidden
<textarea id="log" style="min-height: 20px; width: 95%"></textarea>
```
```js
// hidden logger code - simplifies example
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
### Feature checking
Check whether prioritized task scheduling is supported by testing for the [`scheduler`](/en-US/docs/Web/API/scheduler_property) property in the global "`this`" exposed to the current scope.
The code below prints "Feature: Supported" if the API is supported on this browser.
```html hidden
<textarea id="log" style="min-height: 20px; width: 95%"></textarea>
```
```js hidden
//hidden logger code - simplifies example
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
```js
// Check that feature is supported
if ("scheduler" in this) {
mylog("Feature: Supported");
} else {
mylog("Feature: NOT Supported");
}
```
{{EmbedLiveSample('Feature checking','400px','70px')}}
### Basic usage
Tasks are posted using {{domxref('Scheduler.postTask()')}}, specifying a callback function (task) in the first argument, and an optional second argument that can be used to specify a task priority, signal, and/or delay.
The method returns a {{jsxref("Promise")}} that resolves with the return value of the callback function, or rejects with either an abort error or an error thrown in the function.
```html hidden
<textarea id="log" style="min-height: 100px; width: 95%"></textarea>
```
```js hidden
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
Because it returns a promise, {{domxref('Scheduler.postTask()')}} can be [chained with other promises](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#chained_promises).
Below we show how to wait on the promise to resolve using [`then`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then).
This uses the default priority (`user-visible`).
```js
// A function that defines a task
function myTask() {
return "Task 1: user-visible";
}
if ("scheduler" in this) {
// Post task with default priority: 'user-visible' (no other options)
// When the task resolves, Promise.then() logs the result.
scheduler.postTask(myTask).then((taskResult) => mylog(`${taskResult}`));
}
```
The method can also be used with [`await`](/en-US/docs/Web/JavaScript/Reference/Operators/await) inside an [async function](/en-US/docs/Web/JavaScript/Reference/Statements/async_function).
The code below shows how you might use this approach to wait on a `user-blocking` task.
```js
function myTask2() {
return "Task 2: user-blocking";
}
async function runTask2() {
const result = await scheduler.postTask(myTask2, {
priority: "user-blocking",
});
mylog(result); // Logs 'Task 2: user-blocking'.
}
runTask2();
```
In some cases you might not need to wait on completion at all.
For simplicity many of the examples here simply log the result as the task executes.
```js
// A function that defines a task
function myTask3() {
mylog("Task 3: user-visible");
}
if ("scheduler" in this) {
// Post task and log result when it runs
scheduler.postTask(myTask3);
}
```
The log below shows the output of the three tasks above.
Note that the order they are run depends on the priority first, and then the declaration order.
{{EmbedLiveSample('Basic usage','400px','170px')}}
### Permanent priorities
[Task priorities](#task_priorities) may be set using `priority` parameter in the optional second argument.
Priorities that are set in this way are [immutable](#mutable_and_immutable_task_priority) (cannot be changed).
Below we post two groups of three tasks, each member in reverse order of priority.
The final task has the default priority.
When run, each task simply logs it's expected order (we're not waiting on the result because we don't need to in order to show execution order).
```js hidden
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
```js
if ("scheduler" in this) {
// three tasks, in reverse order of priority
scheduler.postTask(() => mylog("bckg 1"), { priority: "background" });
scheduler.postTask(() => mylog("usr-vis 1"), { priority: "user-visible" });
scheduler.postTask(() => mylog("usr-blk 1"), { priority: "user-blocking" });
// three more tasks, in reverse order of priority
scheduler.postTask(() => mylog("bckg 2"), { priority: "background" });
scheduler.postTask(() => mylog("usr-vis 2"), { priority: "user-visible" });
scheduler.postTask(() => mylog("usr-blk 2"), { priority: "user-blocking" });
// Task with default priority: user-visible
scheduler.postTask(() => mylog("usr-vis 3 (default)"));
}
```
```html hidden
<textarea id="log" style="min-height: 120px; width: 95%"></textarea>
```
The output below shows that the tasks are executed in priority order, and then declaration order.
{{EmbedLiveSample("Permanent priorities",'400px','170px')}}
### Changing task priorities
[Task priorities](#task_priorities) can also take their initial value from a {{domxref("TaskSignal")}} passed to `postTask()` in the optional second argument.
If set in this way, the priority of the task [can then be changed](#mutable_and_immutable_task_priority) using the controller associated with the signal.
> **Note:** Setting and changing task priorities using a signal only works when the `options.priority` argument to `postTask()` is not set, and when the `options.signal` is a {{domxref("TaskSignal")}} (and not an {{domxref("AbortSignal")}}).
The code below first shows how to create a {{domxref("TaskController")}}, setting the initial priority of its signal to `user-blocking` in the [`TaskController()` constructor](/en-US/docs/Web/API/TaskController/TaskController).
The code then uses `addEventListener()` to add an event listener to the controller's signal (we could alternatively use the `TaskSignal.onprioritychange` property to add an event handler).
The event handler uses {{domxref('TaskPriorityChangeEvent.previousPriority', 'previousPriority')}} on the event to get the original priority and {{domxref("TaskSignal.priority")}} on the event target to get the new/current priority.
The task is then posted, passing in the signal, and then we immediately change the priority to `background` by calling {{domxref("TaskController.setPriority()")}} on the controller.
```html hidden
<textarea id="log" style="min-height: 70px; width: 95%"></textarea>
```
```js hidden
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
```js
if ("scheduler" in this) {
// Create a TaskController, setting its signal priority to 'user-blocking'
const controller = new TaskController({ priority: "user-blocking" });
// Listen for 'prioritychange' events on the controller's signal.
controller.signal.addEventListener("prioritychange", (event) => {
const previousPriority = event.previousPriority;
const newPriority = event.target.priority;
mylog(`Priority changed from ${previousPriority} to ${newPriority}.`);
});
// Post task using the controller's signal.
// The signal priority sets the initial priority of the task
scheduler.postTask(() => mylog("Task 1"), { signal: controller.signal });
// Change the priority to 'background' using the controller
controller.setPriority("background");
}
```
The output below demonstrates that the priority was successfully changed to `background` from `user-blocking`.
Note that in this case the priority is changed before the task is executed, but it could equally have been changed while the task was running.
{{EmbedLiveSample("Changing task priorities",'400px','130px')}}
### Aborting tasks
Tasks can be aborted using either {{domxref("TaskController")}} and {{domxref("AbortController")}}, in exactly the same way.
The only difference is that you must use {{domxref("TaskController")}} if you also want to set the task priority.
```html hidden
<textarea id="log" style="min-height: 50px; width: 95%"></textarea>
```
```js hidden
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
The code below creates a controller and passes its signal to the task.
The task is then immediately aborted.
This causes the promise to be rejected with an `AbortError`, which is caught in the `catch` block and logged.
Note that we could also have listened for the [`abort` event](/en-US/docs/Web/API/AbortSignal/abort_event) fired on the {{domxref("TaskSignal")}} or {{domxref("AbortSignal")}} and logged the abort there.
```js
if ("scheduler" in this) {
// Declare a TaskController with default priority
const abortTaskController = new TaskController();
// Post task passing the controller's signal
scheduler
.postTask(() => mylog("Task executing"), {
signal: abortTaskController.signal,
})
.then((taskResult) => mylog(`${taskResult}`)) // This won't run!
.catch((error) => mylog(`Error: ${error}`)); // Log the error
// Abort the task
abortTaskController.abort();
}
```
The log below shows the aborted task.
{{EmbedLiveSample("Aborting tasks",'400px','100px')}}
### Delaying tasks
Tasks can be delayed by specifying an integer number of milliseconds in the `options.delay` parameter to `postTask()`.
This effectively adds the task to the prioritized queue on a timeout, as might be created using [`setTimeout()`](/en-US/docs/Web/API/setTimeout).
The `delay` is the minimum amount of time before the task is added to the scheduler; it may be longer.
```html hidden
<textarea id="log" style="min-height: 50px; width: 95%"></textarea>
```
```js hidden
let log = document.getElementById("log");
function mylog(text) {
log.textContent += `${text}\n`;
}
```
The code below shows two tasks added (as arrow functions) with a delay.
```js
if ("scheduler" in this) {
// Post task as arrow function with delay of 2 seconds
scheduler
.postTask(() => "Task delayed by 2000ms", { delay: 2000 })
.then((taskResult) => mylog(`${taskResult}`));
scheduler
.postTask(() => "Next task should complete in about 2000ms", { delay: 1 })
.then((taskResult) => mylog(`${taskResult}`));
}
```
Refresh the page.
Note that the second string appears in log after about 2 seconds.
{{EmbedLiveSample("Delaying tasks",'400px','100px')}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Building a Faster Web Experience with the postTask Scheduler](https://medium.com/airbnb-engineering/building-a-faster-web-experience-with-the-posttask-scheduler-276b83454e91) on the Airbnb blog (2021)
- [Optimizing long tasks](https://web.dev/articles/optimize-long-tasks#yield_only_when_necessary) on web.dev (2022)
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/gamepad_api/index.md | ---
title: Gamepad API
slug: Web/API/Gamepad_API
page-type: web-api-overview
browser-compat: api.Gamepad
---
{{securecontext_header}}{{DefaultAPISidebar("Gamepad API")}}
The **Gamepad API** is a way for developers to access and respond to signals from gamepads and other game controllers in a simple, consistent way. It contains three interfaces, two events and one specialist function, to respond to gamepads being connected and disconnected, and to access other information about the gamepads themselves, and what buttons and other controls are currently being pressed.
## Interfaces
- [`Gamepad`](/en-US/docs/Web/API/Gamepad)
- : Represents a gamepad/controller connected to the computer.
- [`GamepadButton`](/en-US/docs/Web/API/GamepadButton)
- : Represents a button on one of the connected controllers.
- [`GamepadEvent`](/en-US/docs/Web/API/GamepadEvent)
- : The event object representing events fired that are related to gamepads.
### Experimental Gamepad extensions
- [`GamepadHapticActuator`](/en-US/docs/Web/API/GamepadHapticActuator)
- : Represents hardware in the controller designed to provide haptic feedback to the user (if available), most commonly vibration hardware.
- [`GamepadPose`](/en-US/docs/Web/API/GamepadPose)
- : Represents the pose of a controller (e.g. position and orientation in 3D space) in the case of a [WebVR](/en-US/docs/Web/API/WebVR_API) controller. This is _not_ used by the newer [WebXR](/en-US/docs/Web/API/WebXR_Device_API) standard.
See also the [extensions to the Gamepad interface](/en-US/docs/Web/API/Gamepad#experimental_extensions_to_gamepad), for features that allow you to access the above information.
### Extensions to other interfaces
#### Navigator
- {{domxref("Navigator.getGamepads()")}}
- : An extension to the {{domxref("Navigator")}} object that returns an array of {{domxref("Gamepad")}} objects, one for each connected gamepad.
#### Window events
- {{domxref("Window.gamepadconnected_event", "gamepadconnected")}}
- : An event that will fire when a gamepad is connected.
- {{domxref("Window.gamepaddisconnected_event", "gamepaddisconnected")}}
- : An event that will fire when a gamepad is disconnected.
## Tutorials and guides
- [Using the Gamepad API](/en-US/docs/Web/API/Gamepad_API/Using_the_Gamepad_API)
- [Implementing controls using the Gamepad API](/en-US/docs/Games/Techniques/Controls_Gamepad_API)
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [The Gamepad API](https://hacks.mozilla.org/2013/12/the-gamepad-api/) by Ted Mielczarek and Robert Nyman
- [Simple API demo page](https://luser.github.io/gamepadtest/) ([source](https://github.com/luser/gamepadtest))
| 0 |
data/mdn-content/files/en-us/web/api/gamepad_api | data/mdn-content/files/en-us/web/api/gamepad_api/using_the_gamepad_api/index.md | ---
title: Using the Gamepad API
slug: Web/API/Gamepad_API/Using_the_Gamepad_API
page-type: guide
browser-compat: api.Gamepad
---
{{DefaultAPISidebar("Gamepad API")}}
HTML provides the necessary components for rich, interactive game development. Technologies like `<canvas>`, WebGL, `<audio>`, and `<video>`, along with JavaScript implementations, support tasks that provide similar, if not the same, features as native code. The Gamepad API allows developers and designers to access and use gamepads and other game controllers.
The [Gamepad API](/en-US/docs/Web/API/Gamepad_API) introduces new events on the {{ domxref("Window") }} object for reading gamepad and controller (hereby referred to as _gamepad_) state. In addition to these events, the API also adds a {{ domxref("Gamepad") }} object, which you can use to query the state of a connected gamepad, and a {{ domxref("navigator.getGamepads()") }} method which you can use to get a list of gamepads known to the page.
## Connecting to a gamepad
When a new gamepad is connected to the computer, the focused page first receives a {{ domxref("Window/gamepadconnected_event", "gamepadconnected") }} event. If a gamepad is already connected when the page loaded, the {{ domxref("Window/gamepadconnected_event", "gamepadconnected") }} event is dispatched to the focused page when the user presses a button or moves an axis.
> **Note:** In Firefox, gamepads are only exposed to a page when the user interacts with one with the page visible. This helps prevent gamepads from being used for [fingerprinting](/en-US/docs/Glossary/Fingerprinting) the user. Once one gamepad has been interacted with, other gamepads that are connected will automatically be visible.
You can use {{domxref("Window/gamepadconnected_event", "gamepadconnected")}} like this:
```js
window.addEventListener("gamepadconnected", (e) => {
console.log(
"Gamepad connected at index %d: %s. %d buttons, %d axes.",
e.gamepad.index,
e.gamepad.id,
e.gamepad.buttons.length,
e.gamepad.axes.length,
);
});
```
Each gamepad has a unique ID associated with it, which is available on the event's {{domxref("GamepadEvent.gamepad", "gamepad")}} property.
## Disconnecting a gamepad
When a gamepad is disconnected, and if a page has previously received data for that gamepad (e.g. {{ domxref("Window/gamepadconnected_event", "gamepadconnected") }}), a second event is dispatched to the focused window, {{domxref("Window.gamepaddisconnected_event", "gamepaddisconnected")}}:
```js
window.addEventListener("gamepaddisconnected", (e) => {
console.log(
"Gamepad disconnected from index %d: %s",
e.gamepad.index,
e.gamepad.id,
);
});
```
The gamepad's {{domxref("Gamepad.index", "index")}} property will be unique per-device connected to the system, even if multiple controllers of the same type are used. The `index` property also functions as the index into the {{jsxref("Array")}} returned by {{ domxref("Navigator.getGamepads()") }}.
```js
const gamepads = {};
function gamepadHandler(event, connected) {
const gamepad = event.gamepad;
// Note:
// gamepad === navigator.getGamepads()[gamepad.index]
if (connected) {
gamepads[gamepad.index] = gamepad;
} else {
delete gamepads[gamepad.index];
}
}
window.addEventListener(
"gamepadconnected",
(e) => {
gamepadHandler(e, true);
},
false,
);
window.addEventListener(
"gamepaddisconnected",
(e) => {
gamepadHandler(e, false);
},
false,
);
```
This previous example also demonstrates how the `gamepad` property can be held after the event has completed — a technique we will use for device state querying later.
## Querying the Gamepad object
As you can see, the **gamepad** events discussed above include a `gamepad` property on the event object, which returns a {{ domxref("Gamepad") }} object. We can use this in order to determine which gamepad (i.e., its ID) had caused the event, since multiple gamepads might be connected at once. We can do much more with the {{ domxref("Gamepad") }} object, including holding a reference to it and querying it to find out which buttons and axes are being pressed at any one time. Doing so is often desirable for games or other interactive web pages that need to know the state of a gamepad now vs. the next time an event fires.
Performing such checks tends to involve using the {{ domxref("Gamepad") }} object in conjunction with an animation loop (e.g., {{ domxref("Window.requestAnimationFrame","requestAnimationFrame") }}), where developers want to make decisions for the current frame based on the state of the gamepad or gamepads.
The {{domxref("Navigator.getGamepads()")}} method returns an array of all devices currently visible to the webpage, as {{ domxref("Gamepad") }} objects (the first value is always `null`, so `null` will be returned if there are no gamepads connected.) This can then be used to get the same information. For example, the first code example above could be rewritten as shown below:
```js
window.addEventListener("gamepadconnected", (e) => {
const gp = navigator.getGamepads()[e.gamepad.index];
console.log(
"Gamepad connected at index %d: %s. %d buttons, %d axes.",
gp.index,
gp.id,
gp.buttons.length,
gp.axes.length,
);
});
```
The {{ domxref("Gamepad") }} object's properties are as follows:
- `id`: A string containing some information about the controller. This is not strictly specified, but in Firefox it will contain three pieces of information separated by dashes (`-`): two 4-digit hexadecimal strings containing the USB vendor and product id of the controller, and the name of the controller as provided by the driver. This information is intended to allow you to find a mapping for the controls on the device as well as display useful feedback to the user.
- `index`: An integer that is unique for each gamepad currently connected to the system. This can be used to distinguish multiple controllers. Note that disconnecting a device and then connecting a new device may reuse the previous index.
- `mapping`: A string indicating whether the browser has remapped the controls on the device to a known layout. Currently there is only one supported known layout — the [standard gamepad](https://w3c.github.io/gamepad/gamepad.html#remapping). If the browser is able to map controls on the device to that layout the `mapping` property will be set to the string `standard`.
- `connected`: A boolean indicating whether the gamepad is still connected to the system. If this is so the value is `True`; if not, it is `False`.
- `buttons`: An array of {{ domxref("GamepadButton") }} objects representing the buttons present on the device. Each {{ domxref("GamepadButton") }} has a `pressed` and a `value` property:
- The `pressed` property is a boolean indicating whether the button is currently pressed (`true`) or unpressed (`false`).
- The `value` property is a floating point value used to enable representing analog buttons, such as the triggers on many modern gamepads. The values are normalized to the range 0.0..1.0, with 0.0 representing a button that is not pressed, and 1.0 representing a button that is fully pressed.
- `axes`: An array representing the controls with axes present on the device (e.g. analog thumb sticks). Each entry in the array is a floating point value in the range -1.0 - 1.0, representing the axis position from the lowest value (-1.0) to the highest value (1.0).
- `timestamp`: This returns a {{ domxref("DOMHighResTimeStamp") }} representing the last time the data for this gamepad was updated, allowing developers to determine if the `axes` and `button` data have been updated from the hardware. The value must be relative to the `navigationStart` attribute of the {{ domxref("PerformanceTiming") }} interface. Values are monotonically increasing, meaning that they can be compared to determine the ordering of updates, as newer values will always be greater than or equal to older values. Note that this property is not currently supported in Firefox.
> **Note:** The Gamepad object is available on the {{ domxref("Window/gamepadconnected_event", "gamepadconnected") }} event rather than the {{ domxref("Window") }} object itself, for security reasons. Once we have a reference to it, we can query its properties for information about the current state of the gamepad. Behind the scenes, this object will be updated every time the gamepad's state changes.
### Using button information
Let's look at a simple example that displays connection information for one gamepad (it ignores subsequent gamepad connections) and allows you to move a ball around the screen using the four gamepad buttons on the right-hand side of the gamepad. You can [view the demo live](https://chrisdavidmills.github.io/gamepad-buttons/), and [find the source code](https://github.com/chrisdavidmills/gamepad-buttons/tree/master) on GitHub.
To start with, we declare some variables: The `gamepadInfo` paragraph that the connection info is written into, the `ball` that we want to move, the `start` variable that acts as the ID for `requestAnimation Frame`, the `a` and `b` variables that act as position modifiers for moving the ball, and the shorthand variables that will be used for the {{ domxref("Window.requestAnimationFrame", "requestAnimationFrame()") }} and {{ domxref("Window.cancelAnimationFrame", "cancelAnimationFrame()") }} cross browser forks.
```js
const gamepadInfo = document.getElementById("gamepad-info");
const ball = document.getElementById("ball");
let start;
let a = 0;
let b = 0;
```
Next we use the {{domxref("Window/gamepadconnected_event", "gamepadconnected")}} event to check for a gamepad being connected. When one is connected, we grab the gamepad using {{ domxref("Navigator.getGamepads()") }}`[0]`, print information about the gamepad into our gamepad info `div`, and fire the `gameLoop()` function that starts the whole ball movement process up.
```js
window.addEventListener("gamepadconnected", (e) => {
const gp = navigator.getGamepads()[e.gamepad.index];
gamepadInfo.textContent = `Gamepad connected at index ${gp.index}: ${gp.id}. It has ${gp.buttons.length} buttons and ${gp.axes.length} axes.`;
gameLoop();
});
```
Now we use the {{domxref("Window/gamepaddisconnected_event", "gamepaddisconnected")}} event to check if the gamepad is disconnected again. If so, we stop the {{DOMxRef("Window.requestAnimationFrame", "requestAnimationFrame()")}} loop (see below) and revert the gamepad information back to what it was originally.
```js
window.addEventListener("gamepaddisconnected", (e) => {
gamepadInfo.textContent = "Waiting for gamepad.";
cancelAnimationFrame(start);
});
```
Chrome does things differently here. Instead of constantly storing the gamepad's latest state in a variable it only stores a snapshot, so to do the same thing in Chrome you have to keep polling it and then only use the {{ domxref("Gamepad") }} object in code when it is available. We have done this below using {{ domxref("setInterval()") }}; once the object is available the gamepad info is outputted, the game loop is started, and the interval is cleared using {{ domxref("clearInterval") }}.
```js
let interval;
if (!("ongamepadconnected" in window)) {
// No gamepad events available, poll instead.
interval = setInterval(pollGamepads, 500);
}
function pollGamepads() {
const gamepads = navigator.getGamepads();
for (const gp of gamepads) {
gamepadInfo.textContent = `Gamepad connected at index ${gp.index}: ${gp.id}. It has ${gp.buttons.length} buttons and ${gp.axes.length} axes.`;
gameLoop();
clearInterval(interval);
}
}
```
Now on to the main game loop. In each execution of the loop we check if one of four buttons is being pressed; if so, we update the values of the `a` and `b` movement variables appropriately, then update the {{ cssxref("left") }} and {{ cssxref("top") }} properties, changing their values to the current values of `a` and `b` respectively. This has the effect of moving the ball around the screen.
After all this is done, we use our `requestAnimationFrame()` to request the next animation frame, running `gameLoop()` again.
```js
function buttonPressed(b) {
if (typeof b === "object") {
return b.pressed;
}
return b === 1.0;
}
function gameLoop() {
const gamepads = navigator.getGamepads();
if (!gamepads) {
return;
}
const gp = gamepads[0];
if (buttonPressed(gp.buttons[0])) {
b--;
} else if (buttonPressed(gp.buttons[2])) {
b++;
}
if (buttonPressed(gp.buttons[1])) {
a++;
} else if (buttonPressed(gp.buttons[3])) {
a--;
}
ball.style.left = `${a * 2}px`;
ball.style.top = `${b * 2}px`;
start = requestAnimationFrame(gameLoop);
}
```
## Complete example: Displaying gamepad state
This example shows how to use the {{ domxref("Gamepad") }} object, as well as the {{ domxref("Window/gamepadconnected_event", "gamepadconnected") }} and {{domxref("Window/gamepaddisconnected_event", "gamepaddisconnected")}} events in order to display the state of all gamepads connected to the system. You can find a [working demo](https://luser.github.io/gamepadtest/) and look at the [full source code](https://github.com/luser/gamepadtest) on GitHub.
```js
const haveEvents = "ongamepadconnected" in window;
const controllers = {};
function connecthandler(e) {
addgamepad(e.gamepad);
}
function addgamepad(gamepad) {
controllers[gamepad.index] = gamepad;
const d = document.createElement("div");
d.setAttribute("id", `controller${gamepad.index}`);
const t = document.createElement("h1");
t.textContent = `gamepad: ${gamepad.id}`;
d.appendChild(t);
const b = document.createElement("ul");
b.className = "buttons";
gamepad.buttons.forEach((button, i) => {
const e = document.createElement("li");
e.className = "button";
e.textContent = `Button ${i}`;
b.appendChild(e);
});
d.appendChild(b);
const a = document.createElement("div");
a.className = "axes";
gamepad.axes.forEach((axis, i) => {
const p = document.createElement("progress");
p.className = "axis";
p.setAttribute("max", "2");
p.setAttribute("value", "1");
p.textContent = i;
a.appendChild(p);
});
d.appendChild(a);
// See https://github.com/luser/gamepadtest/blob/master/index.html
const start = document.getElementById("start");
if (start) {
start.style.display = "none";
}
document.body.appendChild(d);
requestAnimationFrame(updateStatus);
}
function disconnecthandler(e) {
removegamepad(e.gamepad);
}
function removegamepad(gamepad) {
const d = document.getElementById(`controller${gamepad.index}`);
document.body.removeChild(d);
delete controllers[gamepad.index];
}
function updateStatus() {
if (!haveEvents) {
scangamepads();
}
Object.entries(controllers).forEach(([i, controller]) => {
const d = document.getElementById(`controller${i}`);
const buttons = d.getElementsByClassName("button");
controller.buttons.forEach((button, i) => {
const b = buttons[i];
let pressed = button === 1.0;
let val = button;
if (typeof button === "object") {
pressed = val.pressed;
val = val.value;
}
const pct = `${Math.round(val * 100)}%`;
b.style.backgroundSize = `${pct} ${pct}`;
b.textContent = pressed ? `Button ${i} [PRESSED]` : `Button ${i}`;
b.style.color = pressed ? "#42f593" : "#2e2d33";
b.className = pressed ? "button pressed" : "button";
});
const axes = d.getElementsByClassName("axis");
controller.axes.forEach((axis, i) => {
const a = axes[i];
a.textContent = `${i}: ${axis.toFixed(4)}`;
a.setAttribute("value", axis + 1);
});
});
requestAnimationFrame(updateStatus);
}
function scangamepads() {
const gamepads = navigator.getGamepads();
document.querySelector("#noDevices").style.display = gamepads.filter(Boolean)
.length
? "none"
: "block";
for (const gamepad of gamepads) {
if (gamepad) {
// Can be null if disconnected during the session
if (gamepad.index in controllers) {
controllers[gamepad.index] = gamepad;
} else {
addgamepad(gamepad);
}
}
}
}
window.addEventListener("gamepadconnected", connecthandler);
window.addEventListener("gamepaddisconnected", disconnecthandler);
if (!haveEvents) {
setInterval(scangamepads, 500);
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/htmlspanelement/index.md | ---
title: HTMLSpanElement
slug: Web/API/HTMLSpanElement
page-type: web-api-interface
browser-compat: api.HTMLSpanElement
---
{{APIRef("HTML DOM")}}
The **`HTMLSpanElement`** interface represents a {{HTMLElement("span")}} element and derives from the {{DOMxRef("HTMLElement")}} interface, but without implementing any additional properties or methods.
{{InheritanceDiagram}}
## Instance properties
_This interface has no properties, but inherits properties from: {{DOMxRef("HTMLElement")}}._
## Instance methods
_This interface has no methods, but inherits methods from: {{DOMxRef("HTMLElement")}}._
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- The HTML element implementing this interface: {{HTMLElement("span")}}.
| 0 |
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data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/performanceresourcetiming/index.md | ---
title: PerformanceResourceTiming
slug: Web/API/PerformanceResourceTiming
page-type: web-api-interface
browser-compat: api.PerformanceResourceTiming
---
{{APIRef("Performance API")}} {{AvailableInWorkers}}
The **`PerformanceResourceTiming`** interface enables retrieval and analysis of detailed network timing data regarding the loading of an application's resources. An application can use the timing metrics to determine, for example, the length of time it takes to fetch a specific resource, such as an {{domxref("XMLHttpRequest")}}, {{SVGElement("SVG","SVG element")}}, image, or script.
## Description
The interface's properties create a resource loading timeline with high-resolution timestamps for network events such as redirect start and end times, fetch start, DNS lookup start and end times, response start and end times, and more. Additionally, the interface extends {{domxref("PerformanceEntry")}} with other properties which provide data about the size of the fetched resource as well as the type of resource that initiated the fetch.
{{InheritanceDiagram}}
### Typical resource timing metrics
The properties of this interface allow you to calculate certain resource timing metrics. Common use cases include:
- Measuring TCP handshake time (`connectEnd` - `connectStart`)
- Measuring DNS lookup time (`domainLookupEnd` - `domainLookupStart`)
- Measuring redirection time (`redirectEnd` - `redirectStart`)
- Measuring interim request time (`firstInterimResponseStart` - `requestStart`)
- Measuring request time (`responseStart` - `requestStart`)
- Measuring TLS negotiation time (`requestStart` - `secureConnectionStart`)
- Measuring time to fetch (without redirects) (`responseEnd` - `fetchStart`)
- Measuring ServiceWorker processing time (`fetchStart` - `workerStart`)
- Checking if content was compressed (`decodedBodySize` should not be `encodedBodySize`)
- Checking if local caches were hit (`transferSize` should be `0`)
- Checking if modern and fast protocols are used (`nextHopProtocol` should be HTTP/2 or HTTP/3)
- Checking if the correct resources are render-blocking (`renderBlockingStatus`)
## Instance properties
### Inherited from `PerformanceEntry`
This interface extends the following {{domxref("PerformanceEntry")}} properties for resource performance entry types by qualifying and constraining them as follows:
- {{domxref("PerformanceEntry.duration")}} {{ReadOnlyInline}}
- : Returns a {{domxref("DOMHighResTimeStamp","timestamp")}} that is the difference between the {{domxref("PerformanceResourceTiming.responseEnd","responseEnd")}} and the {{domxref("PerformanceEntry.startTime","startTime")}} properties.
- {{domxref("PerformanceEntry.entryType")}} {{ReadOnlyInline}}
- : Returns `"resource"`.
- {{domxref("PerformanceEntry.name")}} {{ReadOnlyInline}}
- : Returns the resource's URL.
- {{domxref("PerformanceEntry.startTime")}} {{ReadOnlyInline}}
- : Returns the {{domxref("DOMHighResTimeStamp","timestamp")}} for the time a resource fetch started. This value is equivalent to {{domxref("PerformanceResourceTiming.fetchStart")}}.
### Timestamps
The interface supports the following timestamp properties which you can see in the diagram and are listed in the order in which they are recorded for the fetching of a resource. An alphabetical listing is shown in the navigation, at left.
- {{domxref('PerformanceResourceTiming.redirectStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} that represents the start time of the fetch which initiates the redirect.
- {{domxref('PerformanceResourceTiming.redirectEnd')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately after receiving the last byte of the response of the last redirect.
- {{domxref('PerformanceResourceTiming.workerStart')}} {{ReadOnlyInline}}
- : Returns a {{domxref("DOMHighResTimeStamp")}} immediately before dispatching the {{domxref("FetchEvent")}} if a Service Worker thread is already running, or immediately before starting the Service Worker thread if it is not already running. If the resource is not intercepted by a Service Worker the property will always return 0.
- {{domxref('PerformanceResourceTiming.fetchStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts to fetch the resource.
- {{domxref('PerformanceResourceTiming.domainLookupStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts the domain name lookup for the resource.
- {{domxref('PerformanceResourceTiming.domainLookupEnd')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} representing the time immediately after the browser finishes the domain name lookup for the resource.
- {{domxref('PerformanceResourceTiming.connectStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts to establish the connection to the server to retrieve the resource.
- {{domxref('PerformanceResourceTiming.secureConnectionStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts the handshake process to secure the current connection.
- {{domxref('PerformanceResourceTiming.connectEnd')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately after the browser finishes establishing the connection to the server to retrieve the resource.
- {{domxref('PerformanceResourceTiming.requestStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts requesting the resource from the server.
- {{domxref('PerformanceResourceTiming.firstInterimResponseStart')}} {{experimental_inline}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} that represents the interim response time (for example, 100 Continue or 103 Early Hints).
- {{domxref('PerformanceResourceTiming.responseStart')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately after the browser receives the first byte of the response from the server.
- {{domxref('PerformanceResourceTiming.responseEnd')}} {{ReadOnlyInline}}
- : A {{domxref("DOMHighResTimeStamp")}} immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
### Additional resource information
Additionally, this interface exposes the following properties containing more information about a resource:
- {{domxref('PerformanceResourceTiming.decodedBodySize')}} {{ReadOnlyInline}}
- : A number that is the size (in octets) received from the fetch (HTTP or cache) of the message body, after removing any applied content encoding.
- {{domxref('PerformanceResourceTiming.encodedBodySize')}} {{ReadOnlyInline}}
- : A number representing the size (in octets) received from the fetch (HTTP or cache), of the payload body, before removing any applied content encodings.
- {{domxref('PerformanceResourceTiming.initiatorType')}} {{ReadOnlyInline}}
- : A string representing the web platform feature that initiated the performance entry.
- {{domxref('PerformanceResourceTiming.nextHopProtocol')}} {{ReadOnlyInline}}
- : A string representing the network protocol used to fetch the resource, as identified by the [ALPN Protocol ID (RFC7301)](https://datatracker.ietf.org/doc/html/rfc7301).
- {{domxref('PerformanceResourceTiming.renderBlockingStatus')}} {{ReadOnlyInline}}
- : A string representing the render-blocking status. Either "`blocking`" or "`non-blocking`".
- {{domxref('PerformanceResourceTiming.responseStatus')}} {{experimental_inline}} {{ReadOnlyInline}}
- : A number representing the HTTP response status code returned when fetching the resource.
- {{domxref('PerformanceResourceTiming.transferSize')}} {{ReadOnlyInline}}
- : A number representing the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body.
- {{domxref('PerformanceResourceTiming.serverTiming')}} {{ReadOnlyInline}}
- : An array of {{domxref("PerformanceServerTiming")}} entries containing server timing metrics.
- {{domxref("PerformanceResourceTiming.deliveryType")}} {{experimental_inline}} {{ReadOnlyInline}}
- : Indicates how the resource was delivered — for example from the cache or from a navigational prefetch.
## Instance methods
- {{domxref("PerformanceResourceTiming.toJSON()")}}
- : Returns a JSON representation of the `PerformanceResourceTiming` object.
## Examples
### Logging resource timing information
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
console.log(entry);
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
console.log(entry);
});
```
## Security requirements
### Cross-origin timing information
Many of the resource timing properties are restricted to return `0` or an empty string when the resource is a cross-origin request. To expose cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see resource timing information, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Resource timing (Overview)](/en-US/docs/Web/API/Performance_API/Resource_timing)
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/responseend/index.md | ---
title: "PerformanceResourceTiming: responseEnd property"
short-title: responseEnd
slug: Web/API/PerformanceResourceTiming/responseEnd
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.responseEnd
---
{{APIRef("Performance API")}}
The **`responseEnd`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
Unlike many other `PerformanceResourceTiming` properties, the `responseEnd` property is available for cross-origin requests without the need of the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header.
## Value
A {{domxref("DOMHighResTimeStamp")}} immediately after the browser receives the last
byte of the resource or immediately before the transport connection is closed, whichever
comes first.
## Examples
### Measuring time to fetch (without redirects)
The `responseEnd` and {{domxref("PerformanceResourceTiming.fetchStart", "fetchStart")}} properties can be used to measure the overall time it took to fetch the final resource (without redirects). If you want to include redirects, the overall time to fetch is provided in the {{domxref("PerformanceEntry.duration", "duration")}} property.
```js
const timeToFetch = entry.responseEnd - entry.fetchStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const timeToFetch = entry.responseEnd - entry.fetchStart;
if (timeToFetch > 0) {
console.log(`${entry.name}: Time to fetch: ${timeToFetch}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const timeToFetch = entry.responseEnd - entry.fetchStart;
if (timeToFetch > 0) {
console.log(`${entry.name}: Time to fetch: ${timeToFetch}ms`);
}
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/decodedbodysize/index.md | ---
title: "PerformanceResourceTiming: decodedBodySize property"
short-title: decodedBodySize
slug: Web/API/PerformanceResourceTiming/decodedBodySize
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.decodedBodySize
---
{{APIRef("Performance API")}}
The **`decodedBodySize`** read-only property returns the size (in octets) received from the fetch (HTTP or cache) of the message body after removing any applied content encoding (like gzip or Brotli). If the resource is retrieved from an application cache or local resources, it returns the size of the payload after removing any applied content encoding.
## Value
The `decodedBodySize` property can have the following values:
- A number representing the size (in octets) received from the fetch (HTTP or cache) of the message body, after removing any applied content encoding.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Checking if content was compressed
If the `decodedBodySize` and {{domxref("PerformanceResourceTiming.encodedBodySize", "encodedBodySize")}} properties are non-null and differ, the content was compressed (for example, gzip or Brotli).
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const uncompressed =
entry.decodedBodySize && entry.decodedBodySize === entry.encodedBodySize;
if (uncompressed) {
console.log(`${entry.name} was not compressed!`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const uncompressed =
entry.decodedBodySize && entry.decodedBodySize === entry.encodedBodySize;
if (uncompressed) {
console.log(`${entry.name} was not compressed!`);
}
});
```
### Cross-origin content size information
If the value of the `decodedBodySize` property is `0`, the resource might be a cross-origin request. To expose cross-origin content size information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see content sizes, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/deliverytype/index.md | ---
title: "PerformanceResourceTiming: deliveryType property"
short-title: deliveryType
slug: Web/API/PerformanceResourceTiming/deliveryType
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.PerformanceResourceTiming.deliveryType
---
{{APIRef("Performance API")}}{{SeeCompatTable}}
The **`deliveryType`** read-only property is a string indicating how the resource was delivered — for example from the cache or from a navigational prefetch.
## Value
A string, which can be one of the following values:
- `"cache"`
- : The resource was retrieved from the cache.
- `"navigational-prefetch"` {{experimental_inline}}
- : The resource was retrieved from a prefetched response stored in an in-memory cache via the [Speculation Rules API](/en-US/docs/Web/API/Speculation_Rules_API).
- `""` (empty string)
- : Returned if none of the above delivery types apply.
## Examples
### Filtering resources
The `deliveryType` property can be used to get specific resource timing entries only; for example, only those that were cached.
The following example uses a {{domxref("PerformanceObserver")}} to notify of new `resource` performance entries as they are recorded in the browser's performance timeline. The `buffered` option is used for accessing entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
const cachedResources = list.getEntries().filter((entry) => {
return entry.deliveryType === "cache";
});
console.log(cachedResources);
});
observer.observe({ type: "resource", buffered: true });
```
The following example uses {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call the method.
```js
const scripts = performance.getEntriesByType("resource").filter((entry) => {
return entry.deliveryType === "cache";
});
console.log(scripts);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/connectstart/index.md | ---
title: "PerformanceResourceTiming: connectStart property"
short-title: connectStart
slug: Web/API/PerformanceResourceTiming/connectStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.connectStart
---
{{APIRef("Performance API")}}
The **`connectStart`** read-only property returns the {{domxref("DOMHighResTimeStamp","timestamp")}} immediately before the user agent starts establishing the connection to the server to retrieve the resource.
## Value
The `connectStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts to establish the connection to the server to retrieve the resource.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring TCP handshake time
The `connectStart` and {{domxref("PerformanceResourceTiming.connectEnd", "connectEnd")}} properties can be used to measure how long it takes for the TCP handshake to happen.
```js
const tcp = entry.connectEnd - entry.connectStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const tcp = entry.connectEnd - entry.connectStart;
if (tcp > 0) {
console.log(`${entry.name}: TCP handshake duration: ${tcp}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const tcp = entry.connectEnd - entry.connectStart;
if (tcp > 0) {
console.log(`${entry.name}: TCP handshake duration: ${tcp}ms`);
}
});
```
### Cross-origin timing information
If the value of the `connectStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/fetchstart/index.md | ---
title: "PerformanceResourceTiming: fetchStart property"
short-title: fetchStart
slug: Web/API/PerformanceResourceTiming/fetchStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.fetchStart
---
{{APIRef("Performance API")}}
The **`fetchStart`** read-only property represents a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately before the browser starts to fetch the resource.
If there are HTTP redirects, the property returns the time immediately before the user agent starts to fetch the final resource in the redirection.
Unlike many other `PerformanceResourceTiming` properties, the `fetchStart` property is available for cross-origin requests without the need of the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header.
## Value
A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts to fetch the
resource.
## Examples
### Measuring time to fetch (without redirects)
The `fetchStart` and {{domxref("PerformanceResourceTiming.responseEnd", "responseEnd")}} properties can be used to measure the overall time it took to fetch the final resource (without redirects). If you want to include redirects, the overall time to fetch is provided in the {{domxref("PerformanceEntry.duration", "duration")}} property.
```js
const timeToFetch = entry.responseEnd - entry.fetchStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const timeToFetch = entry.responseEnd - entry.fetchStart;
if (timeToFetch > 0) {
console.log(`${entry.name}: Time to fetch: ${timeToFetch}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const timeToFetch = entry.responseEnd - entry.fetchStart;
if (timeToFetch > 0) {
console.log(`${entry.name}: Time to fetch: ${timeToFetch}ms`);
}
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/encodedbodysize/index.md | ---
title: "PerformanceResourceTiming: encodedBodySize property"
short-title: encodedBodySize
slug: Web/API/PerformanceResourceTiming/encodedBodySize
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.encodedBodySize
---
{{APIRef("Performance API")}}
The **`encodedBodySize`** read-only property represents the size (in octets) received from the fetch (HTTP or cache) of the payload body before removing any applied content encodings (like gzip or Brotli). If the resource is retrieved from an application cache or a local resource, it must
return the size of the payload body before removing any applied content encoding.
## Value
The `encodedBodySize` property can have the following values:
- A number representing the size (in octets) received from the fetch (HTTP or cache), of the payload body, before removing any applied content encoding.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Checking if content was compressed
If the `encodedBodySize` and {{domxref("PerformanceResourceTiming.decodedBodySize", "decodedBodySize")}} properties are non-null and differ, the content was compressed (for example, gzip or Brotli).
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const uncompressed =
entry.decodedBodySize && entry.decodedBodySize === entry.encodedBodySize;
if (uncompressed) {
console.log(`${entry.name} was not compressed!`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const uncompressed =
entry.decodedBodySize && entry.decodedBodySize === entry.encodedBodySize;
if (uncompressed) {
console.log(`${entry.name} was not compressed!`);
}
});
```
### Cross-origin content size information
If the value of the `encodedBodySize` property is `0`, the resource might be a cross-origin request. To expose cross-origin content size information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see content sizes, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/domainlookupstart/index.md | ---
title: "PerformanceResourceTiming: domainLookupStart property"
short-title: domainLookupStart
slug: Web/API/PerformanceResourceTiming/domainLookupStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.domainLookupStart
---
{{APIRef("Performance API")}}
The **`domainLookupStart`** read-only property returns the {{domxref("DOMHighResTimeStamp","timestamp")}} immediately before the browser starts the domain name lookup for the resource.
## Value
The `domainLookupStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} immediately before the browser starts the domain name lookup for the resource.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring DNS lookup time
The `domainLookupStart` and {{domxref("PerformanceResourceTiming.domainLookupEnd", "domainLookupEnd")}} properties can be used to measure how long it takes for the DNS lookup to happen.
```js
const dns = entry.domainLookupEnd - entry.domainLookupStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const dns = entry.domainLookupEnd - entry.domainLookupStart;
if (dns > 0) {
console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const dns = entry.domainLookupEnd - entry.domainLookupStart;
if (dns > 0) {
console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
}
});
```
### Cross-origin timing information
If the value of the `domainLookupStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/responsestatus/index.md | ---
title: "PerformanceResourceTiming: responseStatus property"
short-title: responseStatus
slug: Web/API/PerformanceResourceTiming/responseStatus
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.PerformanceResourceTiming.responseStatus
---
{{APIRef("Performance API")}} {{SeeCompatTable}}
The **`responseStatus`** read-only property represents the HTTP response status code returned when fetching the resource.
This property maps to {{domxref("Response.status")}} from the [Fetch API](/en-US/docs/Web/API/Fetch_API).
## Value
The `responseStatus` property can have the following values:
- A number indicating the [HTTP response status code](/en-US/docs/Web/HTTP/Status) returned when fetching the resource.
- `0` if the [CORS](/en-US/docs/Web/HTTP/CORS) check fails.
- `0` for cross-origin {{HTMLElement("iframe")}} objects.
## Examples
### Checking if a cache was hit
The `responseStatus` property can be used to check for cached resources with a {{HTTPStatus("304")}} `Not Modified` response status code.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
if (entry.responseStatus === 304) {
console.log(`${entry.name} was loaded from cache`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
if (entry.responseStatus === 304) {
console.log(`${entry.name} was loaded from cache`);
}
});
```
Alternatively, if `responseStatus` is not available, you can check if the {{domxref("PerformanceResourceTiming.transferSize", "transferSize")}} property returned `0`.
### Cross-origin response status codes
If the value of the `responseStatus` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin response status codes, the [CORS](/en-US/docs/Web/HTTP/CORS) {{HTTPHeader("Access-Control-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see response status codes, the cross-origin resource should send:
```http
Access-Control-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [HTTP response status code](/en-US/docs/Web/HTTP/Status)
- {{domxref("Response.status")}}
- [CORS](/en-US/docs/Web/HTTP/CORS)
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/transfersize/index.md | ---
title: "PerformanceResourceTiming: transferSize property"
short-title: transferSize
slug: Web/API/PerformanceResourceTiming/transferSize
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.transferSize
---
{{APIRef("Performance API")}}
The **`transferSize`** read-only property represents the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body (as defined by [RFC7230](https://httpwg.org/specs/rfc7230.html#message.body)).
If the resource is fetched from a local cache, or if it is a cross-origin resource, this property returns zero.
## Value
The `transferSize` property can have the following values:
- A number representing the size (in octets) of the fetched resource. The size includes the response header fields plus the [response payload body](https://httpwg.org/specs/rfc7230.html#message.body) (RFC7230).
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Checking if a cache was hit
For environments not supporting the {{domxref("PerformanceResourceTiming.responseStatus", "responseStatus")}} property, the `transferSize` property can be used to determine cache hits. If `transferSize` is zero and the resource has a non-zero decoded body size (meaning the resource is same-origin or has {{HTTPHeader("Timing-Allow-Origin")}}), the resource was fetched from a local cache.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
if (entry.transferSize === 0 && entry.decodedBodySize > 0) {
console.log(`${entry.name} was loaded from cache`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
if (entry.transferSize === 0 && entry.decodedBodySize > 0) {
console.log(`${entry.name} was loaded from cache`);
}
});
```
### Cross-origin content size information
If the value of the `transferSize` property is `0` and wasn't loaded from a local cache, the resource might be a cross-origin request. To expose cross-origin content size information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see content sizes, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/redirectstart/index.md | ---
title: "PerformanceResourceTiming: redirectStart property"
short-title: redirectStart
slug: Web/API/PerformanceResourceTiming/redirectStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.redirectStart
---
{{APIRef("Performance API")}}
The **`redirectStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} representing the start time of the fetch which that initiates the redirect.
If there are HTTP redirects when fetching the resource and if any of the redirects are not from the same origin as the current document, but the timing allow check algorithm passes for each redirected resource, this property returns the starting time of the fetch that initiates the redirect; otherwise, zero is returned.
To get the amount of redirects, see also {{domxref("PerformanceNavigationTiming.redirectCount")}}.
## Value
The `redirectStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp","timestamp")}} representing the start time of the fetch which initiates the redirect.
- `0` if there is no redirect.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring redirection time
The `redirectStart` and {{domxref("PerformanceResourceTiming.redirectEnd", "redirectEnd")}} properties can be used to measure how long the redirection takes.
```js
const redirect = entry.redirectEnd - entry.redirectStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const redirect = entry.redirectEnd - entry.redirectStart;
if (redirect > 0) {
console.log(`${entry.name}: Redirect time: ${redirect}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const redirect = entry.redirectEnd - entry.redirectStart;
if (redirect > 0) {
console.log(`${entry.name}: Redirect time: ${redirect}ms`);
}
});
```
### Cross-origin timing information
If the value of the `redirectStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("PerformanceNavigationTiming.redirectCount")}}
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/renderblockingstatus/index.md | ---
title: "PerformanceResourceTiming: renderBlockingStatus property"
short-title: renderBlockingStatus
slug: Web/API/PerformanceResourceTiming/renderBlockingStatus
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.renderBlockingStatus
---
{{APIRef("Resource Timing API")}}
The **`renderBlockingStatus`** read-only property returns the render-blocking status of the resource.
It is useful to determine resources that:
- weren't render-blocking and therefore could be delayed, or
- were render-blocking and therefore could be preloaded.
## Description
Render-blocking resources are static files, such as fonts, CSS, and JavaScript that block or delay the browser from rendering page content to the screen. The browser determines these blocking resources automatically and doesn't render any pixel to the screen before all stylesheets and synchronous scripts are loaded and evaluated. This prevents Flash of Unstyled Contents ("FOUC").
In addition to the automatic render-blocking mechanism, `blocking="render"` can be provided as an attribute and value to {{HTMLElement("script")}}, {{HTMLElement("style")}} or {{HTMLElement("link")}} elements to specify explicit render-blocking. For example:
```html
<link
blocking="render"
rel="preload"
href="critical-font.woff2"
as="font"
crossorigin />
```
## Value
The `renderBlockingStatus` property can have the following values:
- `"blocking"`
- : The resource might potentially block rendering.
- `"non-blocking"`
- : The resource does not block rendering.
## Examples
### Logging resources that block rendering
The `renderBlockingStatus` property can be used to see resources that block rendering.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
if (entry.renderBlockingStatus === "blocking") {
console.log(`${entry.name} is render-blocking.`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
if (entry.renderBlockingStatus === "blocking") {
console.log(`${entry.name} is render-blocking.`);
}
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/servertiming/index.md | ---
title: "PerformanceResourceTiming: serverTiming property"
short-title: serverTiming
slug: Web/API/PerformanceResourceTiming/serverTiming
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.serverTiming
---
{{APIRef("Performance API")}} {{securecontext_header}}
The **`serverTiming`** read-only property returns an array of {{domxref("PerformanceServerTiming")}} entries containing server timing metrics.
Server timing metrics require the server to send the {{HTTPHeader("Server-Timing")}} header. For example:
```http
Server-Timing: cache;desc="Cache Read";dur=23.2
```
The `serverTiming` entries can live on `navigation` and `resource` entries.
## Value
An array of {{domxref("PerformanceServerTiming")}} entries.
## Examples
### Logging server timing entries
You can use a {{domxref("PerformanceObserver")}} to watch for {{domxref("PerformanceServerTiming")}} entries. Each server entry's duration is logged to the console.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
entry.serverTiming.forEach((serverEntry) => {
console.log(`${serverEntry.name} duration: ${serverEntry.duration}`);
});
});
});
["navigation", "resource"].forEach((type) =>
observer.observe({ type, buffered: true }),
);
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
for (const entryType of ["navigation", "resource"]) {
for (const { name: url, serverTiming } of performance.getEntriesByType(
entryType,
)) {
if (serverTiming) {
for (const { name, duration } of serverTiming) {
console.log(`${url}: ${name} duration: ${duration}`);
}
}
}
}
```
### Cross-origin server timing information
Access to server timing information is restricted to the same origin. To expose cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see server timing information, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("PerformanceServerTiming")}}
- {{HTTPHeader("Server-Timing")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/domainlookupend/index.md | ---
title: "PerformanceResourceTiming: domainLookupEnd property"
short-title: domainLookupEnd
slug: Web/API/PerformanceResourceTiming/domainLookupEnd
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.domainLookupEnd
---
{{APIRef("Performance API")}}
The **`domainLookupEnd`** read-only property returns the {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser finishes the domain-name lookup for the resource.
If the user agent has the domain information in cache, {{domxref("PerformanceResourceTiming.domainLookupStart","domainLookupStart")}} and {{domxref("PerformanceResourceTiming.domainLookupEnd","domainLookupEnd")}} represent the times when the user agent starts and ends the domain data retrieval from the cache.
## Value
The `domainLookupEnd` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} representing the time immediately after the browser finishes the domain name lookup for the resource.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring DNS lookup time
The `domainLookupEnd` and {{domxref("PerformanceResourceTiming.domainLookupStart", "domainLookupStart")}} properties can be used to measure how long it takes for the DNS lookup to happen.
```js
const dns = entry.domainLookupEnd - entry.domainLookupStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const dns = entry.domainLookupEnd - entry.domainLookupStart;
if (dns > 0) {
console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const dns = entry.domainLookupEnd - entry.domainLookupStart;
if (dns > 0) {
console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
}
});
```
### Cross-origin timing information
If the value of the `domainLookupEnd` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/firstinterimresponsestart/index.md | ---
title: "PerformanceResourceTiming: firstInterimResponseStart property"
short-title: firstInterimResponseStart
slug: Web/API/PerformanceResourceTiming/firstInterimResponseStart
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.PerformanceResourceTiming.firstInterimResponseStart
---
{{APIRef("Performance API")}}{{SeeCompatTable}}
The **`firstInterimResponseStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser receives the first byte of the interim 1xx response (for example, 100 Continue or 103 Early Hints) from the server.
There is no _end_ property for `firstInterimResponseStart`.
## Value
The `firstInterimResponseStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} immediately after the browser receives the first interim bytes of the response from the server.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring request time
The `firstInterimResponseStart` and {{domxref("PerformanceResourceTiming.requestStart", "requestStart")}} properties can be used to measure how long it takes to the browser to receive an interim response after the sending the request.
```js
const request = entry.firstInterimResponseStart - entry.requestStart;
```
The following example uses a {{domxref("PerformanceObserver")}} to notify of new `resource` performance entries as they are recorded in the browser's performance timeline. The `buffered` option is used for accessing entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const request = entry.firstInterimResponseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Interim response time: ${request}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
The following example uses {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call the method.
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const request = entry.firstInterimResponseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Interim response time: ${request}ms`);
}
});
```
### Cross-origin timing information
If the value of the `firstInterimResponseStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/secureconnectionstart/index.md | ---
title: "PerformanceResourceTiming: secureConnectionStart property"
short-title: secureConnectionStart
slug: Web/API/PerformanceResourceTiming/secureConnectionStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.secureConnectionStart
---
{{APIRef("Performance API")}}
The **`secureConnectionStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately before the browser starts the handshake process to secure the current connection. If a secure connection is not used, the property returns zero.
## Value
The `secureConnectionStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} indicating the time immediately before the browser starts the handshake process to secure the current connection if the resource is fetched over a secure connection.
- `0` if no secure connection is used.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring TLS negotiation time
The `secureConnectionStart` and {{domxref("PerformanceResourceTiming.requestStart", "requestStart")}} properties can be used to measure how long it takes for the TLS negotiation to happen.
```js
const tls = entry.requestStart - entry.secureConnectionStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const tls = entry.requestStart - entry.secureConnectionStart;
if (tls > 0) {
console.log(`${entry.name}: TLS negotiation duration: ${tls}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const tls = entry.requestStart - entry.secureConnectionStart;
if (tls > 0) {
console.log(`${entry.name}: TLS negotiation duration: ${tls}ms`);
}
});
```
### Cross-origin timing information
If the value of the `secureConnectionStart` property is `0`, the resource is either not using a secure connection or it is a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/workerstart/index.md | ---
title: "PerformanceResourceTiming: workerStart property"
short-title: workerStart
slug: Web/API/PerformanceResourceTiming/workerStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.workerStart
---
{{APIRef("Performance API")}}
The **`workerStart`** read-only property of the {{domxref("PerformanceResourceTiming")}} interface returns a
{{domxref("DOMHighResTimeStamp")}} immediately before dispatching the {{domxref("FetchEvent")}} if a Service Worker thread is already running, or immediately before starting the Service Worker thread if it is not already running. If the resource is not intercepted by a Service Worker the property will always return 0.
## Value
The `workerStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}}.
- `0` if no service worker is used.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring ServiceWorker processing time
The `workerStart` and {{domxref("PerformanceResourceTiming.fetchStart", "fetchStart")}} properties can be used to measure the processing time of a {{domxref("ServiceWorker")}}.
```js
const workerProcessingTime = entry.fetchStart - entry.workerStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const workerProcessingTime = entry.fetchStart - entry.workerStart;
if (workerProcessingTime > 0) {
console.log(
`${entry.name}: Worker processing time: ${workerProcessingTime}ms`,
);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const workerProcessingTime = entry.fetchStart - entry.workerStart;
if (workerProcessingTime > 0) {
console.log(
`${entry.name}: Worker processing time: ${workerProcessingTime}ms`,
);
}
});
```
### Cross-origin timing information
If the value of the `workerStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/requeststart/index.md | ---
title: "PerformanceResourceTiming: requestStart property"
short-title: requestStart
slug: Web/API/PerformanceResourceTiming/requestStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.requestStart
---
{{APIRef("Performance API")}}
The **`requestStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} of the time immediately before the browser starts requesting the resource from the server, cache, or local resource. If the transport connection fails and the browser retires the request, the value returned will be the start of the retry request.
There is no _end_ property for `requestStart`. To measure the request time, calculate {{domxref("PerformanceResourceTiming.responseStart", "responseStart")}} - `requestStart` (see the example below).
## Value
The `requestStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} representing the time immediately before the browser starts requesting the resource from the server.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring request time
The `requestStart` and {{domxref("PerformanceResourceTiming.responseStart", "responseStart")}} properties can be used to measure how long the request takes.
```js
const request = entry.responseStart - entry.requestStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const request = entry.responseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Request time: ${request}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const request = entry.responseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Request time: ${request}ms`);
}
});
```
### Cross-origin timing information
If the value of the `requestStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/responsestart/index.md | ---
title: "PerformanceResourceTiming: responseStart property"
short-title: responseStart
slug: Web/API/PerformanceResourceTiming/responseStart
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.responseStart
---
{{APIRef("Performance API")}}
The **`responseStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser receives the first byte of the response from the server, cache, or local resource.
## Value
The `responseStart` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} immediately after the browser receives the first byte of the response from the server.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring request time
The `responseStart` and {{domxref("PerformanceResourceTiming.requestStart", "requestStart")}} properties can be used to measure how long the request takes.
```js
const request = entry.responseStart - entry.requestStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const request = entry.responseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Request time: ${request}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const request = entry.responseStart - entry.requestStart;
if (request > 0) {
console.log(`${entry.name}: Request time: ${request}ms`);
}
});
```
### Cross-origin timing information
If the value of the `responseStart` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/redirectend/index.md | ---
title: "PerformanceResourceTiming: redirectEnd property"
short-title: redirectEnd
slug: Web/API/PerformanceResourceTiming/redirectEnd
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.redirectEnd
---
{{APIRef("Performance API")}}
The **`redirectEnd`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after receiving the last byte of the response of the last redirect.
When fetching a resource, if there are multiple HTTP redirects, and any of the redirects have an origin that is different from the current document, and the timing allow check algorithm passes for each redirected resource, this property returns the time immediately after receiving the last byte of the response of the last redirect; otherwise, zero is returned.
To get the amount of redirects, see also {{domxref("PerformanceNavigationTiming.redirectCount")}}.
## Value
The `redirectEnd` property can have the following values:
- A {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after receiving the last byte of the response of the last redirect.
- `0` if there is no redirect.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring redirection time
The `redirectEnd` and {{domxref("PerformanceResourceTiming.redirectStart", "redirectStart")}} properties can be used to measure how long the redirection takes.
```js
const redirect = entry.redirectEnd - entry.redirectStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const redirect = entry.redirectEnd - entry.redirectStart;
if (redirect > 0) {
console.log(`${entry.name}: Redirect time: ${redirect}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const redirect = entry.redirectEnd - entry.redirectStart;
if (redirect > 0) {
console.log(`${entry.name}: Redirect time: ${redirect}ms`);
}
});
```
### Cross-origin timing information
If the value of the `redirectEnd` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("PerformanceNavigationTiming.redirectCount")}}
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/initiatortype/index.md | ---
title: "PerformanceResourceTiming: initiatorType property"
short-title: initiatorType
slug: Web/API/PerformanceResourceTiming/initiatorType
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.initiatorType
---
{{APIRef("Performance API")}}
The **`initiatorType`** read-only property is a string representing web platform feature that initiated the resource load.
> **Note:** This property does not represent the type of content fetched. A `.css` file can be fetched using a {{HTMLElement("link")}} element leading to an `initiatorType` of `link`. When loading images using `background: url()` in a CSS file, the `initiatorType` will be `css` and not `img`.
## Value
The `initiatorType` property can have the following values, or `other` if none of the conditions match.
- `audio`
- : If the request was initiated by an {{HTMLElement("audio")}} element's `src` attribute.
- `beacon`
- : If the request was initiated by a {{domxref("navigator.sendBeacon()")}} method.
- `body`
- : If the request was initiated by a {{HTMLElement("body")}} element's `background` attribute.
- `css`
- : If the request was initiated by a CSS `url()` function.
- `early-hint`
- : If the request was initiated by an {{HTTPStatus("103")}} `Early Hint` response.
- `embed`
- : If the request was initiated by an {{HTMLElement("embed")}} element's `src` attribute.
- `fetch`
- : If the request was initiated by a {{domxref("fetch()")}} method.
- `frame`
- : If the request was initiated by loading a {{HTMLElement("frame")}} element.
- `iframe`
- : If the request was initiated by an {{HTMLElement("iframe")}} element's `src` attribute.
- `icon` {{non-standard_inline}}
- : If the request was initiated by a favicon. Non-standard and only reported by Safari.
- `image`
- : If the request was initiated by an {{SVGElement("image")}} element.
- `img`
- : If the request was initiated by an {{HTMLElement("img")}} element's `src` or `srcset` attribute.
- `input`
- : If the request was initiated by an {{HTMLElement("input")}} element of type `image`.
- `link`
- : If the request was initiated by a {{HTMLElement("link")}} element.
- `navigation`
- : If the request was initiated by a navigation request.
- `object`
- : If the request was initiated by an {{HTMLElement("object")}} element.
- `ping`
- : If the request was initiated by an {{HTMLElement("a")}} element's `ping`.
- `script`
- : If the request was initiated by a {{HTMLElement("script")}} element.
- `track`
- : If the request was initiated by a {{HTMLElement("track")}} element's `src`.
- `video`
- : If the request was initiated by a {{HTMLElement("video")}} element's `poster` or `src`.
- `xmlhttprequest`
- : If the request was initiated by an {{domxref("XMLHttpRequest")}}.
## Examples
### Filtering resources
The `initiatorType` property can be used to get specific resource timing entries only. For example, only those that were initiated by {{HTMLElement("script")}} elements.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
const scripts = list.getEntries().filter((entry) => {
return entry.initiatorType === "script";
});
console.log(scripts);
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const scripts = performance.getEntriesByType("resource").filter((entry) => {
return entry.initiatorType === "script";
});
console.log(scripts);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/tojson/index.md | ---
title: "PerformanceResourceTiming: toJSON() method"
short-title: toJSON()
slug: Web/API/PerformanceResourceTiming/toJSON
page-type: web-api-instance-method
browser-compat: api.PerformanceResourceTiming.toJSON
---
{{APIRef("Performance API")}}
The **`toJSON()`** method of the {{domxref("PerformanceResourceTiming")}} interface is a {{Glossary("Serialization","serializer")}}; it returns a JSON representation of the {{domxref("PerformanceResourceTiming")}} object.
## Syntax
```js-nolint
toJSON()
```
### Parameters
None.
### Return value
A {{jsxref("JSON")}} object that is the serialization of the {{domxref("PerformanceResourceTiming")}} object.
## Examples
### Using the toJSON method
In this example, calling `entry.toJSON()` returns a JSON representation of the `PerformanceResourceTiming` object.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
console.log(entry.toJSON());
});
});
observer.observe({ type: "resource", buffered: true });
```
This would log a JSON object like so:
```json
{
"name": "https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/31px-Commons-logo.svg.png",
"entryType": "resource",
"startTime": 110.80000001192093,
"duration": 11.599999994039536,
"initiatorType": "img",
"nextHopProtocol": "h2",
"renderBlockingStatus": "non-blocking",
"workerStart": 0,
"redirectStart": 0,
"redirectEnd": 0,
"fetchStart": 110.80000001192093,
"domainLookupStart": 110.80000001192093,
"domainLookupEnd": 110.80000001192093,
"connectStart": 110.80000001192093,
"connectEnd": 110.80000001192093,
"secureConnectionStart": 110.80000001192093,
"requestStart": 117.30000001192093,
"responseStart": 120.40000000596046,
"responseStatus": 200,
"responseEnd": 122.40000000596046,
"transferSize": 0,
"encodedBodySize": 880,
"decodedBodySize": 880,
"serverTiming": [
{
"name": "cache",
"duration": 0,
"description": "hit-front"
},
{
"name": "host",
"duration": 0,
"description": "cp3061"
}
]
}
```
To get a JSON string, you can use [`JSON.stringify(entry)`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify) directly; it will call `toJSON()` automatically.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{jsxref("JSON")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/nexthopprotocol/index.md | ---
title: "PerformanceResourceTiming: nextHopProtocol property"
short-title: nextHopProtocol
slug: Web/API/PerformanceResourceTiming/nextHopProtocol
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.nextHopProtocol
---
{{APIRef("Performance API")}}
The **`nextHopProtocol`** read-only property is a string representing the network protocol used to fetch the resource, as identified by the [ALPN Protocol ID (RFC7301)](https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids).
When a proxy is used, if a tunnel connection is established, this property returns the ALPN Protocol ID of the tunneled protocol. Otherwise, this property returns the ALPN Protocol ID of the first hop to the proxy.
## Value
The `nextHopProtocol` property can have the following values:
- A string representing the network protocol used to fetch the resource, as identified by the [ALPN Protocol ID (RFC7301)](https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids). Typical values are:
- `"http/0.9"`
- `"http/1.0"`
- `"http/1.1"`
- `"h2"`
- `"h2c"`
- `"h3"`
- An empty string if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Logging resources that use neither HTTP/2 nor HTTP/3
The `nextHopProtocol` property can be used to see resources that don't use the HTTP/2 or HTTP/3 protocols.
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const protocol = entry.nextHopProtocol;
if (protocol && !(protocol === "h2" || protocol === "h3")) {
console.log(`${entry.name} uses ${protocol}.`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const protocol = entry.nextHopProtocol;
if (protocol && !(protocol === "h2" || protocol === "h3")) {
console.log(`${entry.name} uses ${protocol}.`);
}
});
```
### Cross-origin network protocol information
If the value of the `nextHopProtocol` property is an empty string, the resource might be a cross-origin request. To expose cross-origin network protocol information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see network protocol information, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
- {{Glossary("HTTP 2", "HTTP/2")}}
- {{Glossary("HTTP 3", "HTTP/3")}}
| 0 |
data/mdn-content/files/en-us/web/api/performanceresourcetiming | data/mdn-content/files/en-us/web/api/performanceresourcetiming/connectend/index.md | ---
title: "PerformanceResourceTiming: connectEnd property"
short-title: connectEnd
slug: Web/API/PerformanceResourceTiming/connectEnd
page-type: web-api-instance-property
browser-compat: api.PerformanceResourceTiming.connectEnd
---
{{APIRef("Performance API")}}
The **`connectEnd`** read-only property returns the {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser finishes establishing the connection to the server to retrieve the resource. The timestamp value includes the time interval to establish the transport connection, as well as other time intervals such as TLS handshake and [SOCKS](https://en.wikipedia.org/wiki/SOCKS) authentication.
## Value
The `connectEnd` property can have the following values:
- A {{domxref("DOMHighResTimeStamp")}} representing the time after a connection is established.
- `0` if the resource was instantaneously retrieved from a cache.
- `0` if the resource is a cross-origin request and no {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header is used.
## Examples
### Measuring TCP handshake time
The `connectEnd` and {{domxref("PerformanceResourceTiming.connectStart", "connectStart")}} properties can be used to measure how long it takes for the TCP handshake to happen.
```js
const tcp = entry.connectEnd - entry.connectStart;
```
Example using a {{domxref("PerformanceObserver")}}, which notifies of new `resource` performance entries as they are recorded in the browser's performance timeline. Use the `buffered` option to access entries from before the observer creation.
```js
const observer = new PerformanceObserver((list) => {
list.getEntries().forEach((entry) => {
const tcp = entry.connectEnd - entry.connectStart;
if (tcp > 0) {
console.log(`${entry.name}: TCP handshake duration: ${tcp}ms`);
}
});
});
observer.observe({ type: "resource", buffered: true });
```
Example using {{domxref("Performance.getEntriesByType()")}}, which only shows `resource` performance entries present in the browser's performance timeline at the time you call this method:
```js
const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
const tcp = entry.connectEnd - entry.connectStart;
if (tcp > 0) {
console.log(`${entry.name}: TCP handshake duration: ${tcp}ms`);
}
});
```
### Cross-origin timing information
If the value of the `connectEnd` property is `0`, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the {{HTTPHeader("Timing-Allow-Origin")}} HTTP response header needs to be set.
For example, to allow `https://developer.mozilla.org` to see timing resources, the cross-origin resource should send:
```http
Timing-Allow-Origin: https://developer.mozilla.org
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{HTTPHeader("Timing-Allow-Origin")}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/khr_parallel_shader_compile/index.md | ---
title: KHR_parallel_shader_compile extension
short-title: KHR_parallel_shader_compile
slug: Web/API/KHR_parallel_shader_compile
page-type: webgl-extension
browser-compat: api.KHR_parallel_shader_compile
---
{{APIRef("WebGL")}}
The **`KHR_parallel_shader_compile`** extension is part of the [WebGL API](/en-US/docs/Web/API/WebGL_API) and enables a non-blocking poll operation, so that compile/link status availability (`COMPLETION_STATUS_KHR`) can be queried without potentially incurring stalls. In other words you can check the status of your shaders compiling without blocking the runtime.
WebGL extensions are available using the {{domxref("WebGLRenderingContext.getExtension()")}} method. For more information, see also [Using Extensions](/en-US/docs/Web/API/WebGL_API/Using_Extensions) in the [WebGL tutorial](/en-US/docs/Web/API/WebGL_API/Tutorial).
## Constants
- `ext.COMPLETION_STATUS_KHR`
- : A GLenum.
## Examples
Enable the extension:
```js
const ext = gl.getExtension("KHR_parallel_shader_compile");
```
In general, best practice with or without the extension is:
```js
// Assuming lists of `shaders` and `programs`:
for (const x of shaders) gl.compileShader(x); // Never check compile status unless subsequent linking fails.
for (const x of programs) gl.linkProgram(x);
```
With the extension, apps would be able to poll whether programs have linked without janking, but these are likely to take the same total wall time to link:
```js
// Generator yielding a progress ratio [0.0, 1.0].
// Without the extension, this will jank and only check one program per generation.
function* linkingProgress(programs) {
const ext = gl.getExtension("KHR_parallel_shader_compile");
let todo = programs.slice();
while (todo.length) {
if (ext) {
todo = todo.filter(
(x) => !gl.getProgramParameter(x, ext.COMPLETION_STATUS_KHR),
);
} else {
const x = todo.pop();
gl.getProgramParameter(x, gl.LINK_STATUS);
}
if (!todo.length) return;
yield 1.0 - todo.length / programs.length;
}
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGLRenderingContext.getExtension()")}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/inputdevicecapabilities/index.md | ---
title: InputDeviceCapabilities
slug: Web/API/InputDeviceCapabilities
page-type: web-api-interface
status:
- experimental
browser-compat: api.InputDeviceCapabilities
---
{{APIRef("Input Device Capabilities API")}}{{SeeCompatTable}}
The **`InputDeviceCapabilities`** interface of the {{domxref("InputDeviceCapabilities API", "Input Device Capabilities API", "", "nocode")}} provides information about the physical device or a group of related devices responsible for generating input events. Events caused by the same physical input device get the same instance of this object, but the converse isn't true. For example, two mice with the same capabilities in a system may appear as a single `InputDeviceCapabilities` instance.
In some instances, `InputDeviceCapabilities` represents the capabilities of logical devices rather than physical devices. This allows, for example, touchscreen keyboards and physical keyboards to be represented the same way when they produce the same input.
## Constructors
- {{domxref("InputDeviceCapabilities.InputDeviceCapabilities", "InputDeviceCapabilities()")}} {{Experimental_Inline}}
- : Creates an `InputDeviceCapabilities` object.
## Instance properties
- {{DOMxRef("InputDeviceCapabilities.firesTouchEvents")}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : A {{JSxRef("Boolean")}} that indicates whether the device dispatches touch events.
## Instance methods
None.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputdevicecapabilities | data/mdn-content/files/en-us/web/api/inputdevicecapabilities/inputdevicecapabilities/index.md | ---
title: "InputDeviceCapabilities: InputDeviceCapabilities() constructor"
short-title: InputDeviceCapabilities()
slug: Web/API/InputDeviceCapabilities/InputDeviceCapabilities
page-type: web-api-constructor
status:
- experimental
browser-compat: api.InputDeviceCapabilities.InputDeviceCapabilities
---
{{APIRef("Input Device Capabilities API")}}{{SeeCompatTable}}
The `InputDeviceCapabilities()` constructor creates a new
{{domxref("InputDeviceCapabilities")}} object provides information about the physical
device responsible for generating a touch event.
## Syntax
```js-nolint
new InputDeviceCapabilities()
new InputDeviceCapabilities(InputDeviceCapabilitiesInit)
```
### Returns
An instance of the {{domxref("InputDeviceCapabilities")}} interface.
### Parameters
- `InputDeviceCapabilitiesInit` {{optional_inline}}
- : A dictionary object containing a set of device capabilities. It contains the
following property.
- `fireTouchEvents`: A boolean value that indicates
whether the device dispatches touch events.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputdevicecapabilities | data/mdn-content/files/en-us/web/api/inputdevicecapabilities/firestouchevents/index.md | ---
title: "InputDeviceCapabilities: firesTouchEvents property"
short-title: firesTouchEvents
slug: Web/API/InputDeviceCapabilities/firesTouchEvents
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.InputDeviceCapabilities.firesTouchEvents
---
{{APIRef("Input Device Capabilities API")}}{{SeeCompatTable}}
The **`firesTouchEvents`** read-only property of the {{domxref("InputDeviceCapabilities")}} interface returns a boolean value that indicates whether the device dispatches touch events.
You can use this property to detect mouse events that represent an action that may
already have been handled by touch event handlers. This doesn't necessarily mean the
device is a touch screen. For example, stylus and mouse devices typically generate
touch events on mobile browsers.
## Syntax
```js-nolint
const boolean = InputDeviceCapabilities.firesTouchEvents
```
### Returns
A {{jsxref('Boolean')}}
## Example
```js
myButton.addEventListener("mousedown", (e) => {
if (!e.sourceCapabilities.firesTouchEvents) myButton.classList.add("pressed");
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/comment/index.md | ---
title: Comment
slug: Web/API/Comment
page-type: web-api-interface
browser-compat: api.Comment
---
{{ ApiRef("DOM") }}
The **`Comment`** interface represents textual notations within markup; although it is generally not visually shown, such comments are available to be read in the source view.
Comments are represented in HTML and XML as content between '`<!--`' and '`-->`'. In XML, like inside SVG or MathML markup, the character sequence '`--`' cannot be used within a comment.
{{InheritanceDiagram}}
## Instance properties
_This interface has no specific property, but inherits those of its parent, {{domxref("CharacterData")}}, and indirectly those of {{domxref("Node")}}._
## Constructor
- {{ domxref("Comment.Comment()", "Comment()") }}
- : Returns a new `Comment` object with the parameter as its textual content. If not present, its default value is the empty string, `''`.
## Instance methods
_This interface has no specific method, but inherits those of its parent, {{domxref("CharacterData")}}, and indirectly those of {{domxref("Node")}}._
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [The DOM API](/en-US/docs/Web/API/Document_Object_Model)
| 0 |
data/mdn-content/files/en-us/web/api/comment | data/mdn-content/files/en-us/web/api/comment/comment/index.md | ---
title: "Comment: Comment() constructor"
short-title: Comment()
slug: Web/API/Comment/Comment
page-type: web-api-constructor
browser-compat: api.Comment.Comment
---
{{ApiRef("DOM")}}
The **`Comment()`** constructor returns a newly created
{{domxref("Comment")}} object with the optional string given in
parameter as its textual content.
## Syntax
```js-nolint
new Comment()
new Comment(aString)
```
### Parameters
- `aString` {{optional_inline}}
### Return value
A new {{domxref("Comment")}} containing `aString`, or the empty string if no parameter was given.
## Example
```js
let comment = new Comment("Test");
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [The DOM interfaces index](/en-US/docs/Web/API/Document_Object_Model)
- {{domxref("Document.createComment()")}} is an outdated alternative to this constructor.
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/svg_api/index.md | ---
title: SVG API
slug: Web/API/SVG_API
page-type: web-api-overview
spec-urls: https://svgwg.org/svg2-draft/
---
{{DefaultAPISidebar("SVG")}}
SVG provides elements for circles, rectangles, and simple and complex curves. The elements' attribute values specify how these must be drawn. The **SVG API** is the subset of the **DOM** connecting these SVG elements and their attribute values to scripts or programming languages by representing them in memory. The SVG API thus provides methods that allow programmatic access to the SVG elements and their attribute values.
The SVG API is a set of interfaces that have been categorized into the following broad categories:
1. [The element interfaces](#svg_element_interfaces) provide access to the properties of SVG elements and methods to manipulate them.
2. [The static data type](#svg_data_type_interfaces) interfaces provide access to element attribute values and methods to manipulate them.
3. For attributes that can be animated, the [animated data type interfaces](#svg_data_type_interfaces) provide read only access to the current animated value of an attribute.
4. [The Synchronized Multimedia Integration Language (SMIL) interfaces](#smil-related_interfaces)
5. [Others](#other_svg_interfaces)
## Interfaces
### SVG element interfaces
- {{DOMxRef("SVGAElement")}}
- {{DOMxRef("SVGAnimationElement")}}
- {{DOMxRef("SVGAnimateElement")}}
- {{DOMxRef("SVGAnimateMotionElement")}}
- {{DOMxRef("SVGAnimateTransformElement")}}
- {{DOMxRef("SVGCircleElement")}}
- {{DOMxRef("SVGClipPathElement")}}
- {{DOMxRef("SVGComponentTransferFunctionElement")}}
- {{DOMxRef("SVGCursorElement")}}
- {{DOMxRef("SVGDefsElement")}}
- {{DOMxRef("SVGDescElement")}}
- {{DOMxRef("SVGElement")}}
- {{DOMxRef("SVGEllipseElement")}}
- {{DOMxRef("SVGFEBlendElement")}}
- {{DOMxRef("SVGFEColorMatrixElement")}}
- {{DOMxRef("SVGFEComponentTransferElement")}}
- {{DOMxRef("SVGFECompositeElement")}}
- {{DOMxRef("SVGFEConvolveMatrixElement")}}
- {{DOMxRef("SVGFEDiffuseLightingElement")}}
- {{DOMxRef("SVGFEDisplacementMapElement")}}
- {{DOMxRef("SVGFEDistantLightElement")}}
- {{DOMxRef("SVGFEDropShadowElement")}}
- {{DOMxRef("SVGFEFloodElement")}}
- {{DOMxRef("SVGFEFuncAElement")}}
- {{DOMxRef("SVGFEFuncBElement")}}
- {{DOMxRef("SVGFEFuncGElement")}}
- {{DOMxRef("SVGFEFuncRElement")}}
- {{DOMxRef("SVGFEGaussianBlurElement")}}
- {{DOMxRef("SVGFEImageElement")}}
- {{DOMxRef("SVGFEMergeElement")}}
- {{DOMxRef("SVGFEMergeNodeElement")}}
- {{DOMxRef("SVGFEMorphologyElement")}}
- {{DOMxRef("SVGFEOffsetElement")}}
- {{DOMxRef("SVGFEPointLightElement")}}
- {{DOMxRef("SVGFESpecularLightingElement")}}
- {{DOMxRef("SVGFESpotLightElement")}}
- {{DOMxRef("SVGFETileElement")}}
- {{DOMxRef("SVGFETurbulenceElement")}}
- {{DOMxRef("SVGFilterElement")}}
- {{DOMxRef("SVGForeignObjectElement")}}
- {{DOMxRef("SVGGElement")}}
- {{DOMxRef("SVGGeometryElement")}}
- {{DOMxRef("SVGGradientElement")}}
- {{DOMxRef("SVGGraphicsElement")}}
- {{DOMxRef("SVGHatchElement")}} {{Experimental_Inline}}
- {{DOMxRef("SVGHatchpathElement")}} {{Experimental_Inline}}
- {{DOMxRef("SVGImageElement")}}
- {{DOMxRef("SVGLinearGradientElement")}}
- {{DOMxRef("SVGLineElement")}}
- {{DOMxRef("SVGMarkerElement")}} {{Experimental_Inline}}
- {{DOMxRef("SVGMaskElement")}}
- {{DOMxRef("SVGMetadataElement")}}
- {{DOMxRef("SVGMPathElement")}}
- {{DOMxRef("SVGPathElement")}}
- {{DOMxRef("SVGPatternElement")}}
- {{DOMxRef("SVGPolylineElement")}}
- {{DOMxRef("SVGPolygonElement")}}
- {{DOMxRef("SVGRadialGradientElement")}}
- {{DOMxRef("SVGRectElement")}}
- {{DOMxRef("SVGScriptElement")}}
- {{DOMxRef("SVGSetElement")}}
- {{DOMxRef("SVGStopElement")}}
- {{DOMxRef("SVGStyleElement")}}
- {{DOMxRef("SVGSVGElement")}}
- {{DOMxRef("SVGSwitchElement")}}
- {{DOMxRef("SVGSymbolElement")}}
- {{DOMxRef("SVGTextContentElement")}}
- {{DOMxRef("SVGTextElement")}}
- {{DOMxRef("SVGTextPathElement")}}
- {{DOMxRef("SVGTextPositioningElement")}}
- {{DOMxRef("SVGTitleElement")}}
- {{DOMxRef("SVGTSpanElement")}}
- {{DOMxRef("SVGUseElement")}}
- {{DOMxRef("SVGViewElement")}}
### SVG data type interfaces
Here are the DOM APIs for data types used in the definitions of SVG properties and attributes.
#### Static type
- {{DOMxRef("SVGAngle")}}
- {{DOMxRef("SVGElementInstance")}}
- {{DOMxRef("SVGElementInstanceList")}}
- {{DOMxRef("SVGLength")}}
- {{DOMxRef("SVGLengthList")}}
- {{DOMxRef("SVGNameList")}}
- {{DOMxRef("SVGNumber")}}
- {{DOMxRef("SVGNumberList")}}
- {{DOMxRef("SVGPaint")}}
- {{DOMxRef("SVGPreserveAspectRatio")}}
- {{DOMxRef("SVGStringList")}}
- {{DOMxRef("SVGTransform")}}
- {{DOMxRef("SVGTransformList")}}
#### Animated type
- {{DOMxRef("SVGAnimatedAngle")}}
- {{DOMxRef("SVGAnimatedBoolean")}}
- {{DOMxRef("SVGAnimatedEnumeration")}}
- {{DOMxRef("SVGAnimatedInteger")}}
- {{DOMxRef("SVGAnimatedLength")}}
- {{DOMxRef("SVGAnimatedLengthList")}}
- {{DOMxRef("SVGAnimatedNumber")}}
- {{DOMxRef("SVGAnimatedNumberList")}}
- {{DOMxRef("SVGAnimatedPreserveAspectRatio")}}
- {{DOMxRef("SVGAnimatedRect")}}
- {{DOMxRef("SVGAnimatedString")}}
- {{DOMxRef("SVGAnimatedTransformList")}}
### SMIL-related interfaces
- {{DOMxRef("ElementTimeControl")}}
- {{DOMxRef("TimeEvent")}}
### Other SVG interfaces
- {{DOMxRef("GetSVGDocument")}}
- {{DOMxRef("ShadowAnimation")}}
- {{DOMxRef("SVGDocument")}}
- {{DOMxRef("SVGUnitTypes")}}
- {{DOMxRef("SVGUseElementShadowRoot")}}
## Specifications
{{Specifications}}
## See also
- [Getting Started with SVG](/en-US/docs/Web/SVG)
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/webglcontextevent/index.md | ---
title: WebGLContextEvent
slug: Web/API/WebGLContextEvent
page-type: web-api-interface
browser-compat: api.WebGLContextEvent
---
{{APIRef("WebGL")}}
The **WebContextEvent** interface is part of the [WebGL API](/en-US/docs/Web/API/WebGL_API) and is an interface for an event that is generated in response to a status change to the WebGL rendering context.
{{InheritanceDiagram}}
## Constructor
- {{domxref("WebGLContextEvent.WebGLContextEvent", "WebGLContextEvent()")}}
- : Creates a new `WebGLContextEvent` object.
## Instance properties
_This interface inherits properties from its parent interface, {{domxref("Event")}}._
- {{domxref("WebGLContextEvent.statusMessage")}}
- : A read-only property containing additional information about the event.
## Instance methods
_This interface doesn't define any own methods, but inherits methods from its parent interface, {{domxref("Event")}}._
## Examples
With the help of the {{domxref("WEBGL_lose_context")}} extension, you can simulate the {{domxref("HTMLCanvasElement/webglcontextlost_event", "webglcontextlost")}} and {{domxref("HTMLCanvasElement/webglcontextrestored_event", "webglcontextrestored")}} events:
```js
const canvas = document.getElementById("canvas");
const gl = canvas.getContext("webgl");
canvas.addEventListener(
"webglcontextlost",
(e) => {
console.log(e);
},
false,
);
gl.getExtension("WEBGL_lose_context").loseContext();
// WebGLContextEvent event with type "webglcontextlost" is logged.
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGLRenderingContext.isContextLost()")}}
- {{domxref("WEBGL_lose_context")}}, {{domxref("WEBGL_lose_context.loseContext()")}}, {{domxref("WEBGL_lose_context.restoreContext()")}}
- Events: [webglcontextlost](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextlost_event), [webglcontextrestored](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextrestored_event), [webglcontextcreationerror](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event)
| 0 |
data/mdn-content/files/en-us/web/api/webglcontextevent | data/mdn-content/files/en-us/web/api/webglcontextevent/statusmessage/index.md | ---
title: "WebGLContextEvent: statusMessage property"
short-title: statusMessage
slug: Web/API/WebGLContextEvent/statusMessage
page-type: web-api-instance-property
browser-compat: api.WebGLContextEvent.statusMessage
---
{{APIRef("WebGL")}}
The read-only **`WebGLContextEvent.statusMessage`** property contains additional event status information, or is an empty string if no additional information is available.
## Examples
The `statusMessage` property can contain a platform dependent string with details of an event. This can occur, for example, if the {{domxref("HTMLCanvasElement/webglcontextcreationerror_event", "webglcontextcreationerror")}} event is fired.
```js
const canvas = document.getElementById("canvas");
const gl = canvas.getContext("webgl");
canvas.addEventListener(
"webglcontextcreationerror",
(e) => {
console.log(
`WebGL context creation failed: ${e.statusMessage || "Unknown error"}`,
);
},
false,
);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [webglcontextcreationerror](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event)
| 0 |
data/mdn-content/files/en-us/web/api/webglcontextevent | data/mdn-content/files/en-us/web/api/webglcontextevent/webglcontextevent/index.md | ---
title: "WebGLContextEvent: WebGLContextEvent() constructor"
short-title: WebGLContextEvent()
slug: Web/API/WebGLContextEvent/WebGLContextEvent
page-type: web-api-constructor
browser-compat: api.WebGLContextEvent.WebGLContextEvent
---
{{APIRef("WebGL")}}
The **`WebGLContextEvent()`** constructor creates a new {{domxref("WebGLContextEvent")}} object.
> **Note:** You typically don't need to call this constructor; the browser creates these objects automatically when WebGL context events get fired. To manually trigger a `webglcontextlost` event, use {{domxref("WEBGL_lose_context.loseContext()")}}.
## Syntax
```js-nolint
new WebGLContextEvent(type, options)
```
### Parameters
- `type`
- : A string indicating the type of the event.
It is case-sensitive and should be one of `webglcontextcreationerror`, `webglcontextlost`, or `webglcontextrestored`.
- `options` {{Optional_inline}}
- : An object that, _in addition to the properties defined in {{domxref("Event/Event", "Event()")}}_, has the following properties:
- `statusMessage` {{Optional_inline}}
- : A string with additional status information. It defaults to the empty string (`""`).
### Return value
A new {{domxref("WebGLContextEvent")}} object.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [`webglcontextlost`](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextlost_event)
- [`webglcontextrestored`](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextrestored_event)
- [`webglcontextcreationerror`](/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event)
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/serviceworker/index.md | ---
title: ServiceWorker
slug: Web/API/ServiceWorker
page-type: web-api-interface
browser-compat: api.ServiceWorker
---
{{securecontext_header}}{{APIRef("Service Workers API")}}
The **`ServiceWorker`** interface of the [Service Worker API](/en-US/docs/Web/API/Service_Worker_API) provides a reference to a service worker. Multiple {{glossary("browsing context", "browsing contexts")}} (e.g. pages, workers, etc.) can be associated with the same service worker, each through a unique `ServiceWorker` object.
A `ServiceWorker` object is available via a number of properties:
- {{domxref("ServiceWorkerRegistration.active")}}
- {{domxref("ServiceWorkerGlobalScope.serviceWorker")}}
- {{domxref("ServiceWorkerContainer.controller")}} — when the service worker is in `activating` or `activated` state
- {{domxref("ServiceWorkerRegistration.installing")}} — when the service worker is in `installing` state
- {{domxref("ServiceWorkerRegistration.waiting")}} — when the service worker is in `installed` state
The `ServiceWorker` interface is dispatched a set of lifecycle events — `install` and `activate` — and functional events including `fetch`. A `ServiceWorker` object has an associated {{domxref("ServiceWorker.state")}}, related to its lifecycle.
Service workers allow static import of [ECMAScript modules](/en-US/docs/Web/JavaScript/Guide/Modules), if supported, using [`import`](/en-US/docs/Web/JavaScript/Reference/Statements/import).
Dynamic import is disallowed by the specification — calling [`import()`](/en-US/docs/Web/JavaScript/Reference/Operators/import) will throw.
{{InheritanceDiagram}}
## Instance properties
_The `ServiceWorker` interface inherits properties from its parent, {{domxref("EventTarget")}}._
- {{domxref("ServiceWorker.scriptURL")}} {{ReadOnlyInline}}
- : Returns the `ServiceWorker` serialized script URL defined as part of {{domxref("ServiceWorkerRegistration")}}. The URL must be on the same origin as the document that registers the `ServiceWorker`.
- {{domxref("ServiceWorker.state")}} {{ReadOnlyInline}}
- : Returns the state of the service worker. It returns one of the following values: `parsed`, `installing`, `installed`, `activating`, `activated`, or `redundant`.
## Instance methods
_The `ServiceWorker` interface inherits methods from its parent, {{domxref("EventTarget")}}._
- {{domxref("ServiceWorker.postMessage()")}}
- : Sends a message — consisting of any [structured-cloneable](/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm) JavaScript object — to the service worker. The message is transmitted to the service worker using a {{domxref("ServiceWorkerGlobalScope.message_event", "message")}} event on its global scope.
## Events
- {{domxref("ServiceWorker.statechange_event", "statechange")}}
- : Fired when {{domxref("ServiceWorker.state")}} changes.
- {{domxref("ServiceWorker.error_event", "error")}}
- : Fired when an error happens inside the `ServiceWorker` object.
## Examples
This code snippet is from the [service worker registration-events sample](https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html) ([live demo](https://googlechrome.github.io/samples/service-worker/registration-events/)). The code listens for any change in the {{domxref("ServiceWorker.state")}} and returns its value.
```js
if ("serviceWorker" in navigator) {
navigator.serviceWorker
.register("service-worker.js", {
scope: "./",
})
.then((registration) => {
let serviceWorker;
if (registration.installing) {
serviceWorker = registration.installing;
document.querySelector("#kind").textContent = "installing";
} else if (registration.waiting) {
serviceWorker = registration.waiting;
document.querySelector("#kind").textContent = "waiting";
} else if (registration.active) {
serviceWorker = registration.active;
document.querySelector("#kind").textContent = "active";
}
if (serviceWorker) {
// logState(serviceWorker.state);
serviceWorker.addEventListener("statechange", (e) => {
// logState(e.target.state);
});
}
})
.catch((error) => {
// Something went wrong during registration. The service-worker.js file
// might be unavailable or contain a syntax error.
});
} else {
// The current browser doesn't support service workers.
// Perhaps it is too old or we are not in a Secure Context.
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [The Offline Cookbook](https://web.dev/articles/offline-cookbook)(service workers)
- [Using Service Workers](/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers)
- [Service worker basic code example](https://github.com/mdn/dom-examples/tree/main/service-worker/simple-service-worker)
- [Using web workers](/en-US/docs/Web/API/Web_Workers_API/Using_web_workers)
| 0 |
data/mdn-content/files/en-us/web/api/serviceworker | data/mdn-content/files/en-us/web/api/serviceworker/scripturl/index.md | ---
title: "ServiceWorker: scriptURL property"
short-title: scriptURL
slug: Web/API/ServiceWorker/scriptURL
page-type: web-api-instance-property
browser-compat: api.ServiceWorker.scriptURL
---
{{APIRef("Service Workers API")}}{{SecureContext_Header}}
Returns the `ServiceWorker` serialized script URL defined as part of [`ServiceWorkerRegistration`](/en-US/docs/Web/API/ServiceWorkerRegistration).
Must be on the same origin as the document that registers the
`ServiceWorker`.
## Value
A string.
## Examples
```js
const sw = navigator.serviceWorker.controller;
console.log(sw.scriptURL);
// https://example.com/scripts/service-worker.js
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/serviceworker | data/mdn-content/files/en-us/web/api/serviceworker/statechange_event/index.md | ---
title: "ServiceWorker: statechange event"
short-title: statechange
slug: Web/API/ServiceWorker/statechange_event
page-type: web-api-event
browser-compat: api.ServiceWorker.statechange_event
---
{{APIRef("Service Workers API")}}{{SecureContext_Header}}
The `statechange` event fires anytime the {{domxref("ServiceWorker.state")}} changes.
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("statechange", (event) => {});
onstatechange = (event) => {};
```
## Event type
A generic {{domxref("Event")}}.
## Examples
This code snippet is from the [service worker registration-events sample](https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html) ([live demo](https://googlechrome.github.io/samples/service-worker/registration-events/)). The code listens for any change in the {{domxref("ServiceWorker.state")}}
and returns its value.
```js
let serviceWorker;
if (registration.installing) {
serviceWorker = registration.installing;
document.querySelector("#kind").textContent = "installing";
} else if (registration.waiting) {
serviceWorker = registration.waiting;
document.querySelector("#kind").textContent = "waiting";
} else if (registration.active) {
serviceWorker = registration.active;
document.querySelector("#kind").textContent = "active";
}
if (serviceWorker) {
logState(serviceWorker.state);
serviceWorker.addEventListener("statechange", (e) => {
logState(e.target.state);
});
}
```
Note that when `statechange` fires, the service worker's references may have
changed. For example:
```js
navigator.serviceWorker.register("/sw.js").then((swr) => {
swr.installing.state = "installing";
swr.installing.onstatechange = () => {
swr.installing = null;
// At this point, swr.waiting OR swr.active might be true. This is because the statechange
// event gets queued, meanwhile the underlying worker may have gone into the waiting
// state and will be immediately activated if possible.
};
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/serviceworker | data/mdn-content/files/en-us/web/api/serviceworker/postmessage/index.md | ---
title: "ServiceWorker: postMessage() method"
short-title: postMessage()
slug: Web/API/ServiceWorker/postMessage
page-type: web-api-instance-method
browser-compat: api.ServiceWorker.postMessage
---
{{APIRef("Service Workers API")}}{{securecontext_header}}
The **`postMessage()`** method of the {{domxref("ServiceWorker")}} interface sends a message to the worker. The first parameter is the data to send to the worker. The data may be any JavaScript object which can be handled by the [structured clone algorithm](/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm).
The service worker can send back information to its clients by using the {{domxref("Client.postMessage", "postMessage()")}} method. The message will not be sent back to this `ServiceWorker` object but to the associated {{domxref("ServiceWorkerContainer")}} available via {{domxref("navigator.serviceWorker")}}.
## Syntax
```js-nolint
postMessage(message)
postMessage(message, options)
postMessage(message, transfer)
```
### Parameters
- `message`
- : The object to deliver to the worker; this will be in the `data` field in the event delivered to the {{domxref("ServiceWorkerGlobalScope.message_event", "message")}} event. This may be any JavaScript object handled by the [structured clone algorithm](/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm).
The `message` parameter is mandatory. If the data to be passed to the worker is unimportant, `null` or `undefined` must be passed explicitly.
- `options` {{optional_inline}}
- : An optional object containing a `transfer` field with an [array](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) of [transferable objects](/en-US/docs/Web/API/Web_Workers_API/Transferable_objects) to transfer ownership of.
- `transfer` {{optional_inline}}
- : An optional [array](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) of [transferable objects](/en-US/docs/Web/API/Web_Workers_API/Transferable_objects) to transfer ownership of. If the ownership of an object is transferred, it becomes unusable in the context it was sent from and becomes available only to the worker it was sent to.
Transferable objects are instances of classes like {{jsxref("ArrayBuffer")}}, {{domxref("MessagePort")}} or {{domxref("ImageBitmap")}} objects that can be transferred. `null` is not an acceptable value for `transfer`.
> **Note:** The parameters `options` and `transfer` can't both be used at the same time.
### Return value
None ({{jsxref("undefined")}}).
### Exceptions
- {{jsxref("SyntaxError")}}
- : Thrown if the `message` parameter is not provided.
## Examples
In this example a {{domxref("ServiceWorker")}} is created and a message is immediately sent:
```js
navigator.serviceWorker.register("service-worker.js");
navigator.serviceWorker.ready.then((registration) => {
registration.active.postMessage(
"Test message sent immediately after creation",
);
});
```
In order to receive the message, the service worker, in `service-worker.js` has to listen to the {{domxref("ServiceWorkerGlobalScope.message_event", "message")}} event on its global scope.
```js
// This must be in `service-worker.js`
addEventListener("message", (event) => {
console.log(`Message received: ${event.data}`);
});
```
Note that the service worker can send back messages to the main thread using the {{domxref("Client.postMessage()", "postMessage()")}} method. To receive it, the main thread needs to listen for a {{domxref("ServiceWorkerContainer.message_event", "message")}} event on the {{domxref("ServiceWorkerContainer")}} object.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- The {{domxref("ServiceWorker")}} interface it belongs to.
- Its counterpart, the {{domxref("Client.postMessage()", "postMessage()")}} method that a service worker must use to send a message back to the associated {{domxref("ServiceWorkerContainer")}}.
| 0 |
data/mdn-content/files/en-us/web/api/serviceworker | data/mdn-content/files/en-us/web/api/serviceworker/state/index.md | ---
title: "ServiceWorker: state property"
short-title: state
slug: Web/API/ServiceWorker/state
page-type: web-api-instance-property
browser-compat: api.ServiceWorker.state
---
{{APIRef("Service Workers API")}}{{SecureContext_Header}}
The **`state`** read-only property of the
{{domxref("ServiceWorker")}} interface returns a string representing the current state
of the service worker. It can be one of the following values: `parsed`, `installing`,
`installed`, `activating`, `activated`, or
`redundant`.
## Value
A {{jsxref("String")}} that can take one of the following values:
- `"parsed"`
- : The initial state of a service worker after it is downloaded and confirmed to be runnable.
A service worker is never updated to this state, so this will never be the value of the {{DOMxRef("ServiceWorker.statechange_event")}}
- `"installing"`
- : The service worker in this state is considered an installing worker. During this state, {{DOMxRef("ExtendableEvent.waitUntil()")}} can be called inside the `install` event handler to extend the life of the installing worker until the passed promise resolves successfully. This is primarily used to ensure that the service worker is not active until all of the core caches are populated.
- `"installed"`
- : The service worker in this state is considered a waiting worker.
- `"activating"`
- : The service worker in this state is considered an active worker. During this state, {{DOMxRef("ExtendableEvent.waitUntil()")}} can be called inside the `onactivate` event handler to extend the life of the active worker until the passed promise resolves successfully. No functional events are dispatched until the state becomes activated.
- `"activated"`
- : The service worker in this state is considered an active worker ready to handle functional events.
- `"redundant"`
- : A new service worker is replacing the current service worker, or the current service worker is being discarded due to an install failure.
## Examples
This code snippet is from the [service worker registration-events sample](https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html) ([live demo](https://googlechrome.github.io/samples/service-worker/registration-events/)). The code listens for any change in the {{domxref("ServiceWorker.state")}}
and returns its value.
```js
let serviceWorker;
if (registration.installing) {
serviceWorker = registration.installing;
document.querySelector("#kind").textContent = "installing";
} else if (registration.waiting) {
serviceWorker = registration.waiting;
document.querySelector("#kind").textContent = "waiting";
} else if (registration.active) {
serviceWorker = registration.active;
document.querySelector("#kind").textContent = "active";
}
if (serviceWorker) {
logState(serviceWorker.state);
serviceWorker.addEventListener("statechange", (e) => {
logState(e.target.state);
});
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/serviceworker | data/mdn-content/files/en-us/web/api/serviceworker/error_event/index.md | ---
title: "ServiceWorker: error event"
short-title: error
slug: Web/API/ServiceWorker/error_event
page-type: web-api-event
browser-compat: api.ServiceWorker.error_event
---
{{APIRef("Service Workers API")}}{{SecureContext_Header}}
The `error` event fires whenever an error occurs in the service worker.
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("error", (event) => {});
onerror = (event) => {};
```
## Event type
A generic {{domxref("Event")}}.
## Example
The following code snippet gets a handle to the {{domxref("ServiceWorker")}} object via {{domxref("ServiceWorkerRegistration.active")}} and sets up an `onerror` handler on the resulting object:
```js
// in the page being controlled
if (navigator.serviceWorker) {
navigator.serviceWorker.register("service-worker.js");
navigator.serviceWorker.ready.then((registration) => {
registration.active.onerror = (event) => {
console.log("An error occurred in the service worker!");
};
});
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/svgmarkerelement/index.md | ---
title: SVGMarkerElement
slug: Web/API/SVGMarkerElement
page-type: web-api-interface
browser-compat: api.SVGMarkerElement
---
{{APIRef("SVG")}}
The **`SVGMarkerElement`** interface provides access to the properties of {{SVGElement("marker")}} elements, as well as methods to manipulate them. The {{SVGElement("marker")}} element defines the graphics used for drawing marks on a shape.
{{InheritanceDiagram}}
The following properties and methods all return, or act on the attributes of the {{SVGElement("marker")}} element represented by `SVGMarkerElement`.
## Instance properties
_This interface also inherits properties from its parent, {{domxref("SVGElement")}}._
- {{domxref("SVGMarkerElement.markerUnits")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedEnumeration")}} object, with one of the following values:
- 0
- : `SVG_MARKERUNITS_UNKNOWN` which means that the {{SVGattr("markerUnits")}} attribute has a value other than the two predefined keywords.
- 1
- : `SVG_MARKERUNITS_USERSPACEONUSE` which means that the {{SVGattr("markerUnits")}} attribute has the keyword value `userSpaceOnUse`.
- 2
- : `SVG_MARKERUNITS_STROKEWIDTH` which means that the {{SVGattr("markerUnits")}} attribute has the keyword value `strokeWidth`.
- {{domxref("SVGMarkerElement.markerWidth")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedLength")}} object containing the width of the {{SVGElement("marker")}} viewport.
- {{domxref("SVGMarkerElement.markerHeight")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedLength")}} object containing the height of the {{SVGElement("marker")}} viewport.
- {{domxref("SVGMarkerElement.orientType")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedEnumeration")}} object, with one of the following values:
- 0
- : `SVG_MARKER_ORIENT_UNKNOWN` which means that the {{SVGattr("orient")}} attribute has a value other than the two predefined keywords.
- 1
- : `SVG_MARKERUNITS_ORIENT_AUTO` which means that the {{SVGattr("orient")}} attribute has the keyword value `auto`.
- 2
- : `SVG_MARKERUNITS_ORIENT_ANGLE` which means that the {{SVGattr("orient")}} attribute has an {{cssxref("angle")}} or {{cssxref("number")}} value indicating the angle.
- {{domxref("SVGMarkerElement.orientAngle")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedAngle")}} object containing the angle of the {{SVGattr("orient")}} attribute.
- {{domxref("SVGMarkerElement.refX")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedLength")}} object containing the value of the {{SVGattr("refX")}} attribute of the {{SVGElement("marker")}}.
- {{domxref("SVGMarkerElement.refY")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedLength")}} object containing the value of the {{SVGattr("refY")}} attribute of the {{SVGElement("marker")}}.
- {{domxref("SVGMarkerElement.viewBox")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGAnimatedRect")}} object containing an {{domxref("SVGRect")}} which contains the values set by the {{SVGattr("viewBox")}} attribute on the {{SVGElement("marker")}}.
- {{domxref("SVGMarkerElement.preserveAspectRatio")}} {{ReadOnlyInline}}
- : Returns an {{domxref("SVGPreserveAspectRatio")}} object which contains the values set by the {{SVGattr("preserveAspectRatio")}} attribute on the {{SVGElement("marker")}} viewport.
## Instance methods
_This interface also inherits methods from its parent, {{domxref("SVGElement")}}._
- {{domxref("SVGMarkerElement.setOrientToAuto()")}}
- : Sets the value of the {{SVGattr("orient")}} attribute to `auto`.
- {{domxref("SVGMarkerElement.setOrientToAngle()")}}
- : Sets the value of the {{SVGattr("orient")}} attribute to a specific angle value.
## Examples
The following SVG will be referenced in the examples.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="90">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
### Finding the Width of the Marker
The `markerWidth` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("markerWidth")}} attribute.
```js
let marker = document.getElementById("arrow");
console.log(marker.markerWidth.baseVal.value); // 6
```
### Updating the Orientation Angle
In the following example the value of the `orient` attribute is updated using `setOrientToAngle()` using an {{domxref("SVGAngle")}} created using {{domxref("SVGElement.createSVGAngle()")}}.
```js
let svg = document.getElementById("svg");
let marker = document.getElementById("arrow");
console.log(marker.orientAngle.baseVal.value); // value in SVG above - 90
let angle = svg.createSVGAngle();
angle.value = "110";
marker.setOrientToAngle(angle);
console.log(marker.orientAngle.baseVal.value); // new value - 110
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/refy/index.md | ---
title: "SVGMarkerElement: refY property"
short-title: refY
slug: Web/API/SVGMarkerElement/refY
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.refY
---
{{APIRef("SVG")}}
The **`refY`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedLength")}} object containing the value of the {{SVGattr("refY")}} attribute of the {{SVGElement("marker")}}.
## Value
An {{domxref("SVGAnimatedLength")}} object. The `baseVal` property of this object returns an {{domxref("SVGLength")}}, the value of which returns the `refY`.
## Examples
The `markerWidth` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("refY")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.refY.baseVal.value); // 5
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/refx/index.md | ---
title: "SVGMarkerElement: refX property"
short-title: refX
slug: Web/API/SVGMarkerElement/refX
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.refX
---
{{APIRef("SVG")}}
The **`refX`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedLength")}} object containing the value of the {{SVGattr("refX")}} attribute of the {{SVGElement("marker")}}.
## Value
An {{domxref("SVGAnimatedLength")}} object. The `baseVal` property of this object returns an {{domxref("SVGLength")}}, the value of which returns the `refX`.
## Examples
The `markerWidth` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("refX")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.refX.baseVal.value); // 5
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/markerunits/index.md | ---
title: "SVGMarkerElement: markerUnits property"
short-title: markerUnits
slug: Web/API/SVGMarkerElement/markerUnits
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.markerUnits
---
{{APIRef("SVG")}}
The **`markerUnits`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedEnumeration")}} object. This object returns an integer which represents the keyword values that the {{SVGattr("markerUnits")}} attribute accepts.
## Value
An {{domxref("SVGAnimatedEnumeration")}} object. The `baseVal` property of this object contains one of the following values:
- `0`
- : `SVG_MARKERUNITS_UNKNOWN` which means that the {{SVGattr("markerUnits")}} attribute has a value other than the two predefined keywords.
- `1`
- : `SVG_MARKERUNITS_USERSPACEONUSE` which means that the {{SVGattr("markerUnits")}} attribute has the keyword value `userSpaceOnUse`.
- `2`
- : `SVG_MARKERUNITS_STROKEWIDTH` which means that the {{SVGattr("markerUnits")}} attribute has the keyword value `strokeWidth`.
## Examples
The `markerUnits` property returns an {{domxref("SVGAnimatedEnumeration")}} object that contains the value of the {{SVGattr("markerUnits")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse"
markerUnits="strokeWidth">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.markerUnits.baseVal); // 2
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/orientangle/index.md | ---
title: "SVGMarkerElement: orientAngle property"
short-title: orientAngle
slug: Web/API/SVGMarkerElement/orientAngle
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.orientAngle
---
{{APIRef("SVG")}}
The **`orientAngle`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedAngle")}} object containing the angle of the {{SVGattr("orient")}} attribute.
## Value
An {{domxref("SVGAnimatedAngle")}} object. The `baseVal` property of this object returns an {{domxref("SVGAngle")}}, the value of which returns the `angle`.
## Examples
The `orientAngle` property returns an {{domxref("SVGAnimatedAngle")}} which contains an {{domxref("SVGAngle")}} with the angle set by the {{SVGattr("orient")}} attribute as a number representing the number of degrees the marker is turned.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient=".5turn">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.orientAngle.baseVal.value); // 180 as .5turn is 180deg.
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/orienttype/index.md | ---
title: "SVGMarkerElement: orientType property"
short-title: orientType
slug: Web/API/SVGMarkerElement/orientType
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.orientType
---
{{APIRef("SVG")}}
The **`orientType`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedEnumeration")}} object indicating whether the {{SVGattr("orient")}} attribute is `auto`, an angle value, or something else.
This _something else_ is most likely to be the keyword `auto-start-reverse` however the spec leaves it open for this to be other values. Unsupported values will generally be thrown away by the parser, leaving the value the default of `auto`.
## Value
An {{domxref("SVGAnimatedEnumeration")}} object. This contains one of the following values:
- `0`
- : `SVG_MARKER_ORIENT_UNKNOWN` which means that the {{SVGattr("orient")}} attribute has a value other than `auto` or an angle.
- `1`
- : `SVG_MARKERUNITS_ORIENT_AUTO` which means that the {{SVGattr("orient")}} attribute has the keyword value `auto`.
- `2`
- : `SVG_MARKERUNITS_ORIENT_ANGLE` which means that the {{SVGattr("orient")}} attribute has an {{cssxref("angle")}} or {{cssxref("number")}} value indicating the angle.
## Examples
The `orientType` property returns an {{domxref("SVGAnimatedEnumeration")}} object. As the value of the {{SVGattr("orient")}} attribute is an angle, returning the `SVGAnimatedEnumeration.baseVal` returns `2`.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient=".63deg">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.orientType.baseVal); // 2
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/markerheight/index.md | ---
title: "SVGMarkerElement: markerHeight property"
short-title: markerHeight
slug: Web/API/SVGMarkerElement/markerHeight
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.markerHeight
---
{{APIRef("SVG")}}
The **`markerHeight`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedLength")}} object containing the height of the {{SVGElement("marker")}} viewport as defined by the {{SVGattr("markerHeight")}} attribute.
## Value
An {{domxref("SVGAnimatedLength")}} object. The `baseVal` property of this object returns an {{domxref("SVGLength")}}, the value of which returns the `height`.
## Examples
The `markerHeight` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("markerHeight")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.markerHeight.baseVal.value); // 6
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/setorienttoangle/index.md | ---
title: "SVGMarkerElement: setOrientToAngle() method"
short-title: setOrientToAngle()
slug: Web/API/SVGMarkerElement/setOrientToAngle
page-type: web-api-instance-method
browser-compat: api.SVGMarkerElement.setOrientToAngle
---
{{APIRef("SVG")}}
The **`setOrientToAngle()`** method of the {{domxref("SVGMarkerElement")}} interface sets the value of the `orient` attribute to the value in the {{domxref("SVGAngle")}} passed in.
## Syntax
```js-nolint
setOrientToAngle(angle)
```
### Parameters
- `angle`
- : An {{domxref("SVGAngle")}}.
### Return value
None ({{jsxref("undefined")}}).
## Examples
In the following example the value of the `orient` attribute is updated using `setOrientToAngle()` using an {{domxref("SVGAngle")}} created using {{domxref("SVGSVGElement.createSVGAngle()")}}.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="90">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let svg = document.getElementById("svg");
let marker = document.getElementById("arrow");
console.log(marker.orientAngle.baseVal.value); // value in SVG above - 90
let angle = svg.createSVGAngle();
angle.value = "110";
marker.setOrientToAngle(angle);
console.log(marker.orientAngle.baseVal.value); // new value - 110
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/setorienttoauto/index.md | ---
title: "SVGMarkerElement: setOrientToAuto() method"
short-title: setOrientToAuto()
slug: Web/API/SVGMarkerElement/setOrientToAuto
page-type: web-api-instance-method
browser-compat: api.SVGMarkerElement.setOrientToAuto
---
{{APIRef("SVG")}}
The **`setOrientToAuto()`** method of the {{domxref("SVGMarkerElement")}} interface sets the value of the `orient` attribute to `auto`.
## Syntax
```js-nolint
setOrientToAuto()
```
### Parameters
None.
### Return value
None ({{jsxref("undefined")}}).
## Examples
In the following example the value of the `orient` attribute is updated using `setOrientToAuto()`.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="90">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.orientAngle.baseVal.value);
marker.setOrientToAuto();
console.log(marker.orientAngle.baseVal.value);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/viewbox/index.md | ---
title: "SVGMarkerElement: viewBox property"
short-title: viewBox
slug: Web/API/SVGMarkerElement/viewBox
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.viewBox
---
{{APIRef("SVG")}}
The **`viewBox`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedRect")}} object which contains the values set by the {{SVGattr("viewBox")}} attribute on the {{SVGElement("marker")}}.
## Value
An {{domxref("SVGAnimatedRect")}} object. The `baseVal` property of this object returns an {{domxref("SVGRect")}} object, from which can be returned the `x` and `y` co-ordinates, plus the `width` and `height` of the {{SVGElement("marker")}} {{SVGattr("viewBox")}} attribute.
## Examples
This example demonstrates how to return the value of the `width` set for the {{SVGattr("viewBox")}} attribute of {{SVGElement("marker")}}.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
viewBox="xMidYMid meet"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.viewBox.baseVal.width); //10
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/markerwidth/index.md | ---
title: "SVGMarkerElement: markerWidth property"
short-title: markerWidth
slug: Web/API/SVGMarkerElement/markerWidth
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.markerWidth
---
{{APIRef("SVG")}}
The **`markerWidth`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedLength")}} object containing the width of the {{SVGElement("marker")}} viewport as defined by the {{SVGattr("markerWidth")}} attribute.
## Value
An {{domxref("SVGAnimatedLength")}} object. The `baseVal` property of this object returns an {{domxref("SVGLength")}}, the value of which returns the `width`.
## Examples
The `markerWidth` property returns an {{domxref("SVGAnimatedLength")}} which contains an {{domxref("SVGLength")}} with the value of the {{SVGattr("markerWidth")}} attribute.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.markerWidth.baseVal.value); // 6
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/svgmarkerelement | data/mdn-content/files/en-us/web/api/svgmarkerelement/preserveaspectratio/index.md | ---
title: "SVGMarkerElement: preserveAspectRatio property"
short-title: preserveAspectRatio
slug: Web/API/SVGMarkerElement/preserveAspectRatio
page-type: web-api-instance-property
browser-compat: api.SVGMarkerElement.preserveAspectRatio
---
{{APIRef("SVG")}}
The **`preserveAspectRatio`** read-only property of the {{domxref("SVGMarkerElement")}} interface returns an {{domxref("SVGAnimatedPreserveAspectRatio")}} object containing the value of the {{SVGattr("preserveAspectRatio")}} attribute of the {{SVGElement("marker")}}.
## Value
An {{domxref("SVGAnimatedPreserveAspectRatio")}} object. The `baseVal` property of this object returns an {{domxref("SVGPreserveAspectRatio")}} object, with the following properties:
- `align`
- : One of the following numeric constants:
- `0`
- : `SVG_PRESERVEASPECTRATIO_UNKNOWN`
- `1`
- : `SVG_PRESERVEASPECTRATIO_NONE`
- `2`
- : `SVG_PRESERVEASPECTRATIO_XMINYMIN`
- `3`
- : `SVG_PRESERVEASPECTRATIO_XMIDYMIN`
- `4`
- : `SVG_PRESERVEASPECTRATIO_XMAXYMIN`
- `5`
- : `SVG_PRESERVEASPECTRATIO_XMINYMID`
- `6`
- : `SVG_PRESERVEASPECTRATIO_XMIDYMID`
- `7`
- : `SVG_PRESERVEASPECTRATIO_XMAXYMID`
- `8`
- : `SVG_PRESERVEASPECTRATIO_XMINYMAX`
- `9`
- : `SVG_PRESERVEASPECTRATIO_XMIDYMAX`
- `10`
- : `SVG_PRESERVEASPECTRATIO_XMAXYMAX`
- `meetOrSlice`
- : One of the following numeric constants:
- `0`
- : `SVG_MEETORSLICE_UNKNOWN`
- `1`
- : `SVG_MEETORSLICE_MEET`
- `2`
- : `SVG_MEETORSLICE_SLICE`
## Examples
This example demonstrates how to return the numeric constants for `align` and `meetOrSlice` which relate to the values set for the {{SVGattr("preserveAspectRatio")}} attribute of {{SVGElement("marker")}}.
```html
<svg id="svg" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<defs>
<marker
id="arrow"
viewBox="0 0 10 10"
refX="5"
refY="5"
preserveAspectRatio="xMidYMid meet"
markerWidth="6"
markerHeight="6"
orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
</svg>
```
```js
let marker = document.getElementById("arrow");
console.log(marker.preserveAspectRatio.baseVal.align); // 6
console.log(marker.preserveAspectRatio.baseVal.meetOrSlice); // 1
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/periodicsyncevent/index.md | ---
title: PeriodicSyncEvent
slug: Web/API/PeriodicSyncEvent
page-type: web-api-interface
status:
- experimental
browser-compat: api.PeriodicSyncEvent
---
{{APIRef("Periodic Background Sync")}}{{SeeCompatTable}}
The **`PeriodicSyncEvent`** interface of the {{domxref('Web Periodic Background Synchronization API', '', '', 'nocode')}} provides a way to run tasks in the service worker with network connectivity.
An instance of this event is passed to the {{domxref('ServiceWorkerGlobalScope.periodicsync_event', 'periodicsync')}} handler. This happens periodically, at an interval greater than or equal to that set in the {{domxref('PeriodicSyncManager.register()')}} method. Other implementation-specific factors such as the user's engagement with the site decide the actual interval.
{{InheritanceDiagram}}
## Constructor
- {{domxref("PeriodicSyncEvent.PeriodicSyncEvent", "PeriodicSyncEvent()")}} {{Experimental_Inline}}
- : Creates a new `PeriodicSyncEvent` object. This constructor is not typically used. The browser creates these objects itself and provides them to {{domxref('ServiceWorkerGlobalScope.periodicsync_event', 'onperiodicsync')}} callback.
## Instance properties
_Inherits properties from its parent, {{domxref('ExtendableEvent')}}._
- {{domxref('PeriodicSyncEvent.tag')}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : Returns the developer-defined identifier for this `PeriodicSyncEvent`. Multiple tags can be used by the web app to run different periodic tasks at different frequencies.
## Instance methods
_Inherits methods from its parent, {{domxref('ExtendableEvent')}}._
## Examples
The following example shows how to respond to a periodic sync event in the service worker.
```js
self.addEventListener("periodicsync", (event) => {
if (event.tag === "get-latest-news") {
event.waitUntil(fetchAndCacheLatestNews());
}
});
```
`fetchAndCacheLatestNews` is a developer defined function.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Richer offline experiences with the Periodic Background Sync API](https://developer.chrome.com/docs/capabilities/periodic-background-sync)
- [A Periodic Background Sync demo app](https://webplatformapis.com/periodic_sync/periodicSync_improved.html)
| 0 |
data/mdn-content/files/en-us/web/api/periodicsyncevent | data/mdn-content/files/en-us/web/api/periodicsyncevent/tag/index.md | ---
title: "PeriodicSyncEvent: tag property"
short-title: tag
slug: Web/API/PeriodicSyncEvent/tag
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.PeriodicSyncEvent.tag
---
{{APIRef("Periodic Background Sync")}}{{SeeCompatTable}}
The **`tag`** read-only property of the
{{domxref("PeriodicSyncEvent")}} interface returns the developer-defined identifier for
the {{domxref('PeriodicSyncEvent')}}. This is specified when calling the
{{domxref('PeriodicSyncManager.register()')}} method of the
{{domxref('PeriodicSyncManager')}} interface. Multiple tags can be used by the web app
to run different periodic tasks at different frequencies.
## Value
Returns a {{jsxref('String')}} of the defined identifier.
## Examples
The following example demonstrates listening for a periodic sync event in the service
worker, and accessing the `tag` property.
```js
self.addEventListener("periodicsync", (event) => {
console.log(event.tag); // logs the events tag
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Richer offline experiences with the Periodic Background Sync API](https://developer.chrome.com/docs/capabilities/periodic-background-sync)
- [A Periodic Background Sync demo app](https://webplatformapis.com/periodic_sync/periodicSync_improved.html)
| 0 |
data/mdn-content/files/en-us/web/api/periodicsyncevent | data/mdn-content/files/en-us/web/api/periodicsyncevent/periodicsyncevent/index.md | ---
title: "PeriodicSyncEvent: PeriodicSyncEvent() constructor"
short-title: PeriodicSyncEvent()
slug: Web/API/PeriodicSyncEvent/PeriodicSyncEvent
page-type: web-api-constructor
status:
- experimental
browser-compat: api.PeriodicSyncEvent.PeriodicSyncEvent
---
{{APIRef("Periodic Background Sync")}}{{SeeCompatTable}}
The **`PeriodicSyncEvent()`** constructor
creates a new {{domxref("PeriodicSyncEvent")}} object. This constructor is not typically
used. The browser creates these objects itself and provides them to
{{domxref('ServiceWorkerGlobalScope.periodicsync_event', 'onperiodicsync')}} callback.
## Syntax
```js-nolint
new PeriodicSyncEvent(type, options)
```
### Parameters
- `type`
- : A string with the name of the event.
It is case-sensitive and browsers set it to `periodicsync`.
- `options`
- : An object that, _in addition of the properties defined in {{domxref("Event/Event", "Event()")}}_, can have the following properties:
- `tag`
- : The tag referencing the sync event.
### Return value
A new {{domxref("PeriodicSyncEvent")}} object configured using the given inputs.
## Examples
This example constructs a new {{domxref('PeriodicSyncEvent')}} with the relevant
associated tag.
```js
const psEvent = new ExtendableEvent("periodicsync", { tag: "unique-tag" });
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Richer offline experiences with the Periodic Background Sync API](https://developer.chrome.com/docs/capabilities/periodic-background-sync)
- [A Periodic Background Sync demo app](https://webplatformapis.com/periodic_sync/periodicSync_improved.html)
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/inputevent/index.md | ---
title: InputEvent
slug: Web/API/InputEvent
page-type: web-api-interface
browser-compat: api.InputEvent
---
{{APIRef("UI Events")}}
The **`InputEvent`** interface represents an event notifying the user of editable content changes.
{{InheritanceDiagram}}
## Constructor
- {{DOMxRef("InputEvent.InputEvent", "InputEvent()")}}
- : Creates an `InputEvent` object.
## Instance properties
_This interface inherits properties from its parents, {{DOMxRef("UIEvent")}} and {{DOMxRef("Event")}}._
- {{DOMxRef("InputEvent.data")}} {{ReadOnlyInline}}
- : Returns a string with the inserted characters. This may be an empty string if the change doesn't insert text (for example, when deleting characters).
- {{DOMxRef("InputEvent.dataTransfer")}} {{ReadOnlyInline}}
- : Returns a {{DOMxRef("DataTransfer")}} object containing information about richtext or plaintext data being added to or removed from editable content.
- {{DOMxRef("InputEvent.inputType")}} {{ReadOnlyInline}}
- : Returns the type of change for editable content such as, for example, inserting, deleting, or formatting text.
- {{DOMxRef("InputEvent.isComposing")}} {{ReadOnlyInline}}
- : Returns a {{JSxRef("Boolean")}} value indicating if the event is fired after {{domxref("Element/compositionstart_event", "compositionstart")}} and before {{domxref("Element/compositionend_event", "compositionend")}}.
## Instance methods
_This interface inherits methods from its parents, {{DOMxRef("UIEvent")}} and {{DOMxRef("Event")}}._
- {{DOMxRef('InputEvent.getTargetRanges()')}}
- : Returns an array of static ranges that will be affected by a change to the DOM if the input event is not canceled.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [`beforeinput` event](/en-US/docs/Web/API/Element/beforeinput_event)
- [`input` event](/en-US/docs/Web/API/Element/input_event)
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/gettargetranges/index.md | ---
title: "InputEvent: getTargetRanges() method"
short-title: getTargetRanges()
slug: Web/API/InputEvent/getTargetRanges
page-type: web-api-instance-method
browser-compat: api.InputEvent.getTargetRanges
---
{{APIRef("UI Events")}}
The **`getTargetRanges()`** method of the {{domxref("InputEvent")}} interface returns an array of static ranges that will be affected by a change to the DOM if the input event is not canceled.
This allows web apps to override text edit behavior before the browser modifies the DOM tree, and provides more control over input events to improve performance.
Depending on the value of `inputType` and the current editing host, the expected return value of this method varies:
<table>
<thead>
<tr>
<th>inputType</th>
<th>Editing host</th>
<th>Response of <code>getTargetRanges()</code></th>
</tr>
</thead>
<tbody>
<tr>
<td><code>"historyUndo"</code> or <code>"historyRedo"</code></td>
<td>Any</td>
<td>empty Array</td>
</tr>
<tr>
<td>All remaining</td>
<td><code>contenteditable</code></td>
<td>
an Array of
{{domxref("StaticRange")}}
objects associated with event
</td>
</tr>
<tr>
<td>All remaining</td>
<td>
<a href="/en-US/docs/Web/HTML/Element/input"><code>input</code></a>
or <a href="/en-US/docs/Web/HTML/Element/textarea"><code>textarea</code></a>
</td>
<td>
an empty Array
</td>
</tr>
</tbody>
</table>
## Syntax
```js-nolint
getTargetRanges()
```
### Parameters
None.
### Return value
An array of {{domxref("StaticRange")}} objects.
## Examples
### Feature Detection
The following function returns true if `beforeinput`, and thus
`getTargetRanges`, is supported.
```js
function isBeforeInputEventAvailable() {
return (
window.InputEvent &&
typeof InputEvent.prototype.getTargetRanges === "function"
);
}
```
### Basic usage
The following example selects a `contenteditable` element and utilizes the
[`beforeinput`](/en-US/docs/Web/API/Element/beforeinput_event)
event to log the result of `getTargetRanges()`.
```js
const editableElem = document.querySelector('[contenteditable="true"]');
editableElem.addEventListener("beforeinput", (e) => {
const targetRanges = e.getTargetRanges();
console.log(targetRanges);
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/data/index.md | ---
title: "InputEvent: data property"
short-title: data
slug: Web/API/InputEvent/data
page-type: web-api-instance-property
browser-compat: api.InputEvent.data
---
{{APIRef("UI Events")}}
The **`data`** read-only property of the
{{domxref("InputEvent")}} interface returns a string with inserted
characters. This may be an empty string if the change doesn't insert text, such as when
characters are deleted.
## Value
A string.
## Examples
In the following example, an event listener receives the [input](/en-US/docs/Web/API/Element/input_event) event. Any textual change
to the {{htmlelement("input")}} element is retrieved by `InputEvent.data` and
inserted into a paragraph using the
[`Node.textContent`](/en-US/docs/Web/API/Node/textContent)
property.
```html
<p>Some text to copy and paste.</p>
<input type="text" />
<p class="result"></p>
```
```js
const editable = document.querySelector("input");
const result = document.querySelector(".result");
editable.addEventListener("input", (e) => {
result.textContent = `Inputted text: ${e.data}`;
});
```
{{EmbedLiveSample('Examples')}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/inputtype/index.md | ---
title: "InputEvent: inputType property"
short-title: inputType
slug: Web/API/InputEvent/inputType
page-type: web-api-instance-property
browser-compat: api.InputEvent.inputType
---
{{APIRef("UI Events")}}
The **`inputType`** read-only property of the
{{domxref("InputEvent")}} interface returns the type of change made to editable content.
Possible changes include for example inserting, deleting, and formatting text.
## Value
A string containing the type of input that was made. There are many
possible values, such as `insertText`, `deleteContentBackward`,
`insertFromPaste`, and `formatBold`. For a complete list of the
available input types, see the [Attributes section of the Input Events Level 2 spec](https://w3c.github.io/input-events/#interface-InputEvent-Attributes).
## Examples
This example logs the `inputType` for [input events](/en-US/docs/Web/API/Element/input_event) on an editable
{{htmlElement("div")}}.
### HTML
```html
<p id="log">Input type:</p>
<div
contenteditable="true"
style="margin: 20px;padding: 20px;border:2px dashed red;">
<p>
Some sample text. Try inserting line breaks, or deleting text in different
ways, or pasting different content in.
</p>
<hr />
<ul>
<li>A sample</li>
<li>bulleted</li>
<li>list.</li>
</ul>
<p>Another paragraph.</p>
</div>
```
### JavaScript
```js
const log = document.getElementById("log");
const editable = document.querySelector("div[contenteditable]");
editable.addEventListener("input", logInputType);
function logInputType(event) {
log.textContent = `Input type: ${event.inputType}`;
}
```
### Result
Try editing the text inside the `<div>` and see what happens.
{{EmbedLiveSample("Examples", '100%', 500)}}
> **Note:** See also [Masayuki Nakano's InputEvent test suite](https://d-toybox.com/studio/lib/input_event_viewer.html) for a more detailed example.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/datatransfer/index.md | ---
title: "InputEvent: dataTransfer property"
short-title: dataTransfer
slug: Web/API/InputEvent/dataTransfer
page-type: web-api-instance-property
browser-compat: api.InputEvent.dataTransfer
---
{{APIRef("UI Events")}}
The **`dataTransfer`** read-only property of the
{{domxref("InputEvent")}} interface returns a {{domxref("DataTransfer")}} object
containing information about richtext or plaintext data being added to or removed from
editable content.
## Value
A {{domxref("DataTransfer")}} object.
## Examples
In the following simple example we've set up an event listener on the [input](/en-US/docs/Web/API/Element/input_event) event so that when any
content is pasted into the contenteditable {{htmlelement("p")}} element, its HTML source
is retrieved via the
[`InputEvent.dataTransfer.getData()`](/en-US/docs/Web/API/DataTransfer/getData)
method and reported in the paragraph below the input.
Try copying and pasting some of the content provided to see the effects.
```html
<p><span style="font-weight: bold; color: blue">Whoa, bold blue text!</span></p>
<p>
<span style="font-style: italic; color: red">Exciting: italic red text!</span>
</p>
<p>Boring normal text ;-(</p>
<hr />
<p contenteditable="true">
Go on, try pasting some content into this editable paragraph and see what
happens!
</p>
<p class="result"></p>
```
```js
const editable = document.querySelector("p[contenteditable]");
const result = document.querySelector(".result");
editable.addEventListener("input", (e) => {
result.textContent = e.dataTransfer.getData("text/html");
});
```
{{EmbedLiveSample('Examples', '100%', 250)}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/inputevent/index.md | ---
title: "InputEvent: InputEvent() constructor"
short-title: InputEvent()
slug: Web/API/InputEvent/InputEvent
page-type: web-api-constructor
browser-compat: api.InputEvent.InputEvent
---
{{APIRef("UI Events")}}
The **`InputEvent()`** constructor creates a new {{domxref("InputEvent")}} object.
## Syntax
```js-nolint
new InputEvent(type)
new InputEvent(type, options)
```
### Parameters
- `type`
- : A string with the name of the event.
It is case-sensitive and browsers set it to `beforeinput`, or `input`.
- `options` {{optional_inline}}
- : An object that, _in addition of the properties defined in {{domxref("UIEvent/UIEvent", "UIEvent()")}}_, can have the following properties:
- `inputType` {{optional_inline}}
- : A string specifying the type of change for editable content
such as, for example, inserting, deleting, or formatting text.
- `data` {{optional_inline}}
- : A string containing characters to insert.
This may be an empty string if the change doesn't insert text
(such as when deleting characters, for example).
- `isComposing` {{optional_inline}}
- : A boolean indicating that the event is part of a composition session,
meaning it is after a {{domxref("Element/compositionstart_event", "compositionstart")}} event but before a {{domxref("Element/compositionend_event", "compositionend")}} event. The default is `false`.
## Return value
A new {{domxref("InputEvent")}} object.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("InputEvent")}}, the interface of the objects it constructs.
| 0 |
data/mdn-content/files/en-us/web/api/inputevent | data/mdn-content/files/en-us/web/api/inputevent/iscomposing/index.md | ---
title: "InputEvent: isComposing property"
short-title: isComposing
slug: Web/API/InputEvent/isComposing
page-type: web-api-instance-property
browser-compat: api.InputEvent.isComposing
---
{{APIRef("UI Events")}}
The **`InputEvent.isComposing`** read-only property returns a
boolean value indicating if the event is fired after
{{domxref("Element/compositionstart_event", "compositionstart")}} and before {{domxref("Element/compositionend_event", "compositionend")}}.
## Value
A boolean.
## Examples
```js
const inputEvent = new InputEvent("syntheticInput", false);
console.log(inputEvent.isComposing); // return false
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("Element/compositionstart_event", "compositionstart")}} and {{domxref("Element/compositionend_event", "compositionend")}}
- {{domxref("InputEvent")}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/mimetype/index.md | ---
title: MimeType
slug: Web/API/MimeType
page-type: web-api-interface
status:
- deprecated
browser-compat: api.MimeType
---
{{APIRef("HTML DOM")}}{{Deprecated_Header}}
The **`MimeType`** interface provides contains information about a MIME type associated with a particular plugin. {{domxref("Navigator.mimeTypes")}} returns an array of this object.
## Instance properties
- {{domxref("MimeType.type")}} {{Deprecated_Inline}}
- : Returns the MIME type of the associated plugin.
- {{domxref("MimeType.description")}} {{Deprecated_Inline}}
- : Returns a description of the associated plugin or an empty string if there is none.
- {{domxref("MimeType.suffixes")}} {{Deprecated_Inline}}
- : A string containing valid file extensions for the data displayed by the plugin, or an empty string if an extension is not valid for the particular module. For example, a browser's content decryption module may appear in the plugin list but support more file extensions than can be anticipated. It might therefore return an empty string.
- {{domxref("MimeType.enabledPlugin")}} {{Deprecated_Inline}}
- : Returns an instance of {{domxref("Plugin")}} containing information about the plugin itself.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/ambientlightsensor/index.md | ---
title: AmbientLightSensor
slug: Web/API/AmbientLightSensor
page-type: web-api-interface
status:
- experimental
browser-compat: api.AmbientLightSensor
---
{{securecontext_header}}{{APIRef("Sensor API")}}{{SeeCompatTable}}
The **`AmbientLightSensor`** interface of the [Sensor APIs](/en-US/docs/Web/API/Sensor_APIs) returns the current light level or illuminance of the ambient light around the hosting device.
To use this sensor, the user must grant permission to the `'ambient-light-sensor'` device sensor through the [Permissions API](/en-US/docs/Web/API/Permissions_API).
This feature may be blocked by a [Permissions Policy](/en-US/docs/Web/HTTP/Permissions_Policy) set on your server.
{{InheritanceDiagram}}
## Constructor
- {{domxref("AmbientLightSensor.AmbientLightSensor()", "AmbientLightSensor()")}} {{Experimental_Inline}}
- : Creates a new `AmbientLightSensor` object.
## Instance properties
- {{domxref('AmbientLightSensor.illuminance')}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : Returns the current light level in [lux](https://en.wikipedia.org/wiki/Lux) of the ambient light level around the hosting device.
## Instance methods
_`AmbientLightSensor` doesn't have own methods. However, it inherits methods from its parent interfaces, {{domxref("Sensor")}} and {{domxref("EventTarget")}}._
## Events
_`AmbientLightSensor` doesn't have own events. However, it inherits events from its parent interface, {{domxref('Sensor')}}._
## Example
```js
if ("AmbientLightSensor" in window) {
const sensor = new AmbientLightSensor();
sensor.addEventListener("reading", (event) => {
console.log("Current light level:", sensor.illuminance);
});
sensor.addEventListener("error", (event) => {
console.log(event.error.name, event.error.message);
});
sensor.start();
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/ambientlightsensor | data/mdn-content/files/en-us/web/api/ambientlightsensor/ambientlightsensor/index.md | ---
title: "AmbientLightSensor: AmbientLightSensor() constructor"
short-title: AmbientLightSensor()
slug: Web/API/AmbientLightSensor/AmbientLightSensor
page-type: web-api-constructor
status:
- experimental
browser-compat: api.AmbientLightSensor.AmbientLightSensor
---
{{securecontext_header}}{{APIRef("Sensor API")}}{{SeeCompatTable}}
The **`AmbientLightSensor()`** constructor creates a new {{domxref("AmbientLightSensor")}} object, which returns the current light level or illuminance of the ambient light around the hosting device.
## Syntax
```js-nolint
new AmbientLightSensor()
new AmbientLightSensor(options)
```
### Parameters
- `options` {{optional_inline}}
- : Currently only one option is supported:
- `frequency` {{optional_inline}}
- : The desired number of times per second a sample should be taken, meaning the number of times per second that {{domxref('sensor.reading_event', 'reading')}} event will be called. A whole number or decimal may be used, the latter for frequencies less than a second. The actual reading frequency depends on the device hardware and consequently may be less than requested.
### Exceptions
- `SecurityError` {{domxref("DOMException")}}
- : Use of this feature was blocked by a [Permissions Policy](/en-US/docs/Web/HTTP/Permissions_Policy).
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref('sensor.reading_event', 'reading')}} event
| 0 |
data/mdn-content/files/en-us/web/api/ambientlightsensor | data/mdn-content/files/en-us/web/api/ambientlightsensor/illuminance/index.md | ---
title: "AmbientLightSensor: illuminance property"
short-title: illuminance
slug: Web/API/AmbientLightSensor/illuminance
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.AmbientLightSensor.illuminance
---
{{securecontext_header}}{{APIRef("Sensor API")}}{{SeeCompatTable}}
The **`illuminance`** read-only property of the {{domxref("AmbientLightSensor")}} interface returns the current light level in [lux](https://en.wikipedia.org/wiki/Lux) of the ambient light level around the hosting device.
## Value
A {{jsxref('Number')}} indicating the current light level in lux.
## Examples
```js
if ("AmbientLightSensor" in window) {
const sensor = new AmbientLightSensor();
sensor.addEventListener("reading", (event) => {
console.log("Current light level:", sensor.illuminance);
});
sensor.addEventListener("error", (event) => {
console.log(event.error.name, event.error.message);
});
sensor.start();
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api | data/mdn-content/files/en-us/web/api/workernavigator/index.md | ---
title: WorkerNavigator
slug: Web/API/WorkerNavigator
page-type: web-api-interface
browser-compat: api.WorkerNavigator
---
{{APIRef("Web Workers API")}}
The **`WorkerNavigator`** interface represents a subset of the {{DOMxRef("Navigator")}} interface allowed to be accessed from a {{DOMxRef("Worker")}}. Such an object is initialized for each worker and is available via the {{DOMxRef("WorkerGlobalScope.navigator", "self.navigator")}} property.
## Instance properties
_The `WorkerNavigator` interface doesn't inherit any property._
- {{DOMxRef("WorkerNavigator.appCodeName")}} {{Deprecated_Inline}} {{ReadOnlyInline}}
- : Always returns `'Mozilla'`, in any browser. This property is kept only for compatibility purposes.
- {{DOMxRef("WorkerNavigator.appName")}} {{Deprecated_Inline}} {{ReadOnlyInline}}
- : Returns the official name of the browser. Do not rely on this property to return the correct value.
- {{DOMxRef("WorkerNavigator.appVersion")}} {{Deprecated_Inline}} {{ReadOnlyInline}}
- : Returns the version of the browser as a string. Do not rely on this property to return the correct value.
- {{DOMxRef("WorkerNavigator.connection")}} {{ReadOnlyInline}}
- : Provides a {{DOMxRef("NetworkInformation")}} object containing information about the network connection of a device.
- {{domxref("WorkerNavigator.deviceMemory")}} {{ReadOnlyInline}}
- : Returns the amount of device memory in gigabytes. This value is an approximation given by rounding to the nearest power of 2 and dividing that number by 1024.
- {{domxref("WorkerNavigator.globalPrivacyControl")}} {{ReadOnlyInline}} {{Experimental_Inline}} {{non-standard_inline}}
- : Returns a boolean indicating a user's consent to their information being shared or sold.
- {{domxref("WorkerNavigator.gpu")}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : Returns the {{domxref("GPU")}} object for the current worker context. The entry point for the {{domxref("WebGPU_API", "WebGPU API", "", "nocode")}}.
- {{DOMxRef("WorkerNavigator.hardwareConcurrency")}} {{ReadOnlyInline}}
- : Returns the number of logical processor cores available.
- {{DOMxRef("WorkerNavigator.language")}} {{ReadOnlyInline}}
- : Returns a string representing the preferred language of the user, usually the language of the browser UI. The `null` value is returned when this is unknown.
- {{DOMxRef("WorkerNavigator.languages")}} {{ReadOnlyInline}}
- : Returns an array of strings representing the languages known to the user, by order of preference.
- {{DOMxRef("WorkerNavigator.locks")}} {{ReadOnlyInline}}
- : Returns a {{DOMxRef("LockManager")}} object which provides methods for requesting a new {{DOMxRef('Lock')}} object and querying for an existing {{DOMxRef('Lock')}} object.
- {{DOMxRef("WorkerNavigator.mediaCapabilities")}} {{ReadOnlyInline}}
- : Returns a {{domxref("MediaCapabilities")}} object that can expose information about the decoding and encoding capabilities for a given format and output capabilities.
- {{DOMxRef("WorkerNavigator.onLine")}} {{ReadOnlyInline}}
- : Returns a boolean value indicating whether the browser is online.
- {{DOMxRef("WorkerNavigator.permissions")}} {{ReadOnlyInline}}
- : Returns a {{DOMxRef("Permissions")}} object that can be used to query and update permission status of APIs covered by the [Permissions API](/en-US/docs/Web/API/Permissions_API).
- {{DOMxRef("WorkerNavigator.platform")}} {{Deprecated_Inline}} {{ReadOnlyInline}}
- : Returns a string representing the platform of the browser. Do not rely on this property to return the correct value.
- {{DOMxRef("WorkerNavigator.product")}} {{Deprecated_Inline}} {{ReadOnlyInline}}
- : Always returns `'Gecko'`, on any browser. This property is kept only for compatibility purposes.
- {{domxref("WorkerNavigator.serial")}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : Returns a {{domxref("Serial")}} object, which represents the entry point into the {{domxref("Web Serial API")}} to enable the control of serial ports.
- {{domxref("WorkerNavigator.serviceWorker")}} {{ReadOnlyInline}}
- : Returns a {{domxref("ServiceWorkerContainer")}} object, which provides access to registration, removal, upgrade, and communication with the {{domxref("ServiceWorker")}} objects for the [associated document](https://html.spec.whatwg.org/multipage/browsers.html#concept-document-window).
- {{DOMxRef("WorkerNavigator.storage")}} {{ReadOnlyInline}}
- : Returns a {{DOMxRef('StorageManager')}} interface for managing persistence permissions and estimating available storage.
- {{domxref("WorkerNavigator.usb")}} {{ReadOnlyInline}}
- : Returns a {{domxref("USB")}} object for the current document, providing access to [WebUSB API](/en-US/docs/Web/API/WebUSB_API) functionality.
- {{DOMxRef("WorkerNavigator.userAgent")}} {{ReadOnlyInline}}
- : Returns the user agent string for the current browser.
- {{domxref("WorkerNavigator.userAgentData")}} {{ReadOnlyInline}} {{Experimental_Inline}}
- : Returns a {{domxref("NavigatorUAData")}} object, which gives access to information about the browser and operating system of the user.
## Instance methods
_The `WorkerNavigator` interface doesn't inherit any method._
- {{domxref("Navigator.clearAppBadge()")}}
- : Clears a badge on the current app's icon and returns a {{jsxref("Promise")}} that resolves with {{jsxref("undefined")}}.
- {{domxref("Navigator.setAppBadge()")}}
- : Sets a badge on the icon associated with this app and returns a {{jsxref("Promise")}} that resolves with {{jsxref("undefined")}}.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- Other Worker-related interfaces: {{DOMxRef("Worker")}}, {{DOMxRef("WorkerLocation")}}, and {{DOMxRef("WorkerGlobalScope")}}
- [Using web workers](/en-US/docs/Web/API/Web_Workers_API/Using_web_workers)
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/appcodename/index.md | ---
title: "WorkerNavigator: appCodeName property"
short-title: appCodeName
slug: Web/API/WorkerNavigator/appCodeName
page-type: web-api-instance-property
status:
- deprecated
browser-compat: api.WorkerNavigator.appCodeName
---
{{APIRef("HTML DOM")}} {{Deprecated_Header}}
The value of the **`WorkerNavigator.appCodeName`** property is
always "`Mozilla`", in any browser. This property is kept only for
compatibility purposes.
> **Note:** Do not rely on this property to return a real
> product name. All browsers return "`Mozilla`" as the value of this property.
## Value
The string "`Mozilla`".
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator.appName")}}
- {{domxref("WorkerNavigator.product")}}
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/languages/index.md | ---
title: "WorkerNavigator: languages property"
short-title: languages
slug: Web/API/WorkerNavigator/languages
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.languages
---
{{APIRef("HTML DOM")}}
The **`WorkerNavigator.languages`** read-only property
returns an array of strings representing the user's preferred
languages. The language is described using language tags according to
{{RFC(5646, "Tags for Identifying Languages (also known as BCP 47)")}}. In the returned
array they are ordered by preference with the most preferred language first.
The value of {{domxref("WorkerNavigator.language","navigator.language")}} is the
first element of the returned array.
When its value changes, as the user's preferred languages are changed a
{{domxref("Window.languagechange_event", "languagechange")}} event is fired on the {{domxref("WorkerGlobalScope")}} object.
The `Accept-Language` HTTP header in every HTTP request from the user's
browser uses the same value for the `navigator.languages` property except for
the extra `qvalues` (quality values) field (e.g. `en-US;q=0.8`).
## Value
An array or strings.
## Examples
You can run this insert a web worker:
```js
navigator.language; //"en-US"
navigator.languages; //["en-US", "zh-CN", "ja-JP"]
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator.language")}}
- {{domxref("WorkerNavigator")}}
- {{domxref("WorkerGlobalScope.languagechange_event", "languagechange")}} event
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/appname/index.md | ---
title: "WorkerNavigator: appName property"
short-title: appName
slug: Web/API/WorkerNavigator/appName
page-type: web-api-instance-property
status:
- deprecated
browser-compat: api.WorkerNavigator.appName
---
{{APIRef("HTML DOM")}} {{Deprecated_Header}}
The value of the **`WorkerNavigator.appName`** property is always
"`Netscape`", in any browser. This property is kept only for compatibility
purposes.
> **Note:** Do not rely on this property to return a real browser name. All browsers return "`Netscape`" as the value of this property.
## Value
The string "`Netscape`".
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator.appCodeName")}}
- {{domxref("WorkerNavigator.product")}}
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/serial/index.md | ---
title: "WorkerNavigator: serial property"
short-title: serial
slug: Web/API/WorkerNavigator/serial
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.WorkerNavigator.serial
---
{{APIRef("Web Serial API")}}{{SeeCompatTable}}{{SecureContext_Header}}
The **`serial`** read-only property of the {{domxref("WorkerNavigator")}} interface returns a {{domxref("Serial")}} object which represents the entry point into the {{domxref("Web Serial API")}}.
When getting, the same instance of the {{domxref("Serial")}} object will always be returned.
## Value
A {{domxref("Serial")}} object.
## Examples
The following example uses the `getPorts()` method to initialize a list of available ports.
```js
navigator.serial.getPorts().then((ports) => {
// Initialize the list of available ports.
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Read from and write to a serial port](https://developer.chrome.com/docs/capabilities/serial)
- [Getting started with the web serial API](https://codelabs.developers.google.com/codelabs/web-serial#0)
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/product/index.md | ---
title: "WorkerNavigator: product property"
short-title: product
slug: Web/API/WorkerNavigator/product
page-type: web-api-instance-property
status:
- deprecated
browser-compat: api.WorkerNavigator.product
---
{{APIRef("HTML DOM")}} {{Deprecated_Header}}
The value of the **`WorkerNavigator.product`** property is always
"`Gecko`", in any browser. This property is kept only for compatibility
purposes.
> **Note:** Do not rely on this property to return a real product name. All browsers return "`Gecko`" as the value of this property.
## Value
The string "`Gecko`".
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator.appCodeName")}}
- {{domxref("WorkerNavigator.appName")}}
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/platform/index.md | ---
title: "WorkerNavigator: platform property"
short-title: platform
slug: Web/API/WorkerNavigator/platform
page-type: web-api-instance-property
status:
- deprecated
browser-compat: api.WorkerNavigator.platform
---
{{ APIRef("HTML DOM") }} {{Deprecated_Header}}
Returns a string representing the platform of the browser. The specification allows
browsers to always return the empty string, so don't rely on this property to get a
reliable answer.
## Value
A string identifying the platform on which the browser is running, or
an empty string if the browser declines to (or is unable to) identify the platform.
`platform` is a string that must be an empty string or a string representing
the platform on which the browser is executing.
For example: "`MacIntel`", "`Win32`", "`FreeBSD i386`", "`WebTV OS`".
## Examples
```js
console.log(navigator.platform);
```
## Usage notes
On Windows, modern browsers return `"Win32"` even if running on a 64-bit version of Windows
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/hardwareconcurrency/index.md | ---
title: "WorkerNavigator: hardwareConcurrency property"
short-title: hardwareConcurrency
slug: Web/API/WorkerNavigator/hardwareConcurrency
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.hardwareConcurrency
---
{{APIRef("HTML DOM")}}
The **`navigator.hardwareConcurrency`** read-only property
returns the number of logical processors available to run threads on the user's
computer.
## Value
A {{jsxref("Number")}} indicating the number of logical processor cores.
Modern computers have multiple physical processor cores in their CPU (two or four cores
is typical), but each physical core is also usually able to run more than one thread at
a time using advanced scheduling techniques. So a four-core CPU may offer eight
**logical processor cores**, for example. The number of logical processor
cores can be used to measure the number of threads which can effectively be run at once
without them having to context switch.
The browser may, however, choose to report a lower number of logical cores in order to
represent more accurately the number of {{domxref("Worker")}}s that can run at once, so
don't treat this as an absolute measurement of the number of cores in the user's system.
## Examples
In this example, one {{domxref("Worker")}} is created for each logical processor
reported by the browser and a record is created which includes a reference to the new
worker as well as a Boolean value indicating whether or not we're using that worker yet;
these objects are, in turn, stored into an array for later use. This creates a pool of
workers we can use to process requests later.
The following code can be run in a worker:
```js
let workerList = [];
for (let i = 0; i < navigator.hardwareConcurrency; i++) {
let newWorker = {
worker: new Worker("cpuworker.js"),
inUse: false,
};
workerList.push(newWorker);
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator")}}
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/serviceworker/index.md | ---
title: "WorkerNavigator: serviceWorker property"
short-title: serviceWorker
slug: Web/API/WorkerNavigator/serviceWorker
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.serviceWorker
---
{{securecontext_header}}{{APIRef("Service Workers API")}}
The **`serviceWorker`** read-only property of the {{domxref("WorkerNavigator")}} interface returns the {{domxref("ServiceWorkerContainer")}} object for the [associated document](https://html.spec.whatwg.org/multipage/browsers.html#concept-document-window), which provides access to registration, removal, upgrade, and communication with the {{domxref("ServiceWorker")}}.
The feature may not be available in private mode.
## Value
{{domxref("ServiceWorkerContainer")}}.
## Examples
This code checks if the browser supports using service worker in workers.
```js
if ("serviceWorker" in navigator) {
// Supported!
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("Service Worker API", "", "", "nocode")}}
- [Using Service Workers](/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers)
| 0 |
data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/useragent/index.md | ---
title: "WorkerNavigator: userAgent property"
short-title: userAgent
slug: Web/API/WorkerNavigator/userAgent
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.userAgent
---
{{ApiRef("HTML DOM")}}
The **`WorkerNavigator.userAgent`** read-only property returns the
user agent string for the current browser.
> **Note:** The specification asks browsers to provide as little information via this field as
> possible. Never assume that the value of this property will stay the same in future
> versions of the same browser. Try not to use it at all, or only for current and past
> versions of a browser. New browsers may start using the same UA, or part of it, as an
> older browser: you really have no guarantee that the browser agent is indeed the one
> advertised by this property.
>
> Also keep in mind that users of a browser can change the value of this field if they
> want (UA spoofing).
Browser identification based on detecting the user agent string is
**unreliable** and **is not recommended**, as the user agent
string is user configurable. For example:
- In Firefox, you can change the preference `general.useragent.override` in
`about:config`. Some Firefox extensions do that; however, this only changes
the HTTP header that gets sent, and doesn't affect browser detection performed by
JavaScript code.
- Opera 6+ allows users to set the browser identification string via a menu.
## Value
A string specifying the complete user agent string the browser
provides both in {{Glossary("HTTP")}} headers and in response to this and other related
methods on the {{domxref("WorkerNavigator")}} object.
The user agent string is built on a formal structure which can be decomposed into
several pieces of info. Each of these pieces of info comes from other navigator
properties which are also settable by the user. Gecko-based browsers comply with the
following general structure:
```plain
userAgent = appCodeName/appVersion number (Platform; Security; OS-or-CPU;
Localization; rv: revision-version-number) product/productSub
Application-Name Application-Name-version
```
## Examples
```js
alert(navigator.userAgent);
// alerts "Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.2) Gecko/20010725 Netscape6/6.1"
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{httpheader("User-Agent")}} HTTP header
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/language/index.md | ---
title: "WorkerNavigator: language property"
short-title: language
slug: Web/API/WorkerNavigator/language
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.language
---
{{APIRef("HTML DOM")}}
The **`WorkerNavigator.language`** read-only property returns
a string representing the preferred language of the user, usually the language of the
browser UI.
## Value
A string representing the
language version as defined in {{RFC(5646, "Tags for Identifying Languages (also known as BCP 47)")}}. Examples of valid language
codes include "en", "en-US", "fr", "fr-FR", "es-ES", etc.
Note that in Safari on iOS prior to 10.2, the country code returned is lowercase:
"en-us", "fr-fr" etc.
## Examples
You can run this insert a web worker:
```js
if (/^en\b/.test(navigator.language)) {
doLangSelect(window.navigator.language);
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WorkerNavigator.languages")}}
- {{domxref("WorkerNavigator")}}
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/appversion/index.md | ---
title: "WorkerNavigator: appVersion property"
short-title: appVersion
slug: Web/API/WorkerNavigator/appVersion
page-type: web-api-instance-property
status:
- deprecated
browser-compat: api.WorkerNavigator.appVersion
---
{{APIRef("HTML DOM")}} {{Deprecated_Header}}
Returns either "`4.0`" or a string representing version information about
the browser.
> **Note:** Do not rely on this property to return the correct browser version.
## Value
Either "`4.0`" or a string representing version information about the
browser.
## Examples
```js
alert(`Your browser version is reported as ${navigator.appVersion}`);
```
## Notes
The `navigator.userAgent` property may also contain the version
number (for example
"`Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.2) Gecko/20010725 Netscape 6/6.1`"),
but you should be aware of how easy it is to change the user agent string and "spoof"
other browsers, platforms, or user agents, and also how cavalier the browser vendor
themselves are with these properties.
The `navigator.appVersion`, `navigator.appName` and
`navigator.userAgent` properties have been used in "browser sniffing"
code: scripts that attempt to find out what kind of browser you are using and adjust
pages accordingly. This lead to the current situation, where browsers had to return fake
values from these properties in order not to be locked out of some websites.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/useragentdata/index.md | ---
title: "WorkerNavigator: userAgentData property"
short-title: userAgentData
slug: Web/API/WorkerNavigator/userAgentData
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.WorkerNavigator.userAgentData
---
{{APIRef("User-Agent Client Hints API")}}{{SeeCompatTable}}{{securecontext_header}}
The **`userAgentData`** read-only property of the {{domxref("WorkerNavigator")}} interface returns an {{domxref("NavigatorUAData")}} object
which can be used to access the {{domxref("User-Agent Client Hints API")}}.
## Value
A {{domxref("NavigatorUAData")}} object.
## Examples
The following example prints the value of {{domxref("NavigatorUAData.brands")}} to the console.
```js
console.log(navigator.userAgentData.brands);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Improving user privacy and developer experience with User-Agent Client Hints](https://developer.chrome.com/docs/privacy-security/user-agent-client-hints)
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/mediacapabilities/index.md | ---
title: "WorkerNavigator: mediaCapabilities property"
short-title: mediaCapabilities
slug: Web/API/WorkerNavigator/mediaCapabilities
page-type: web-api-instance-property
browser-compat: api.WorkerNavigator.mediaCapabilities
---
{{APIRef("HTML DOM")}}
The read-only **`WorkerNavigator.mediaCapabilities`** property
returns a {{domxref("MediaCapabilities")}} object that can expose information about the
decoding and encoding capabilities for a given format and output capabilities as defined
by the [Media Capabilities API](/en-US/docs/Web/API/Media_Capabilities_API).
## Value
A {{domxref("MediaCapabilities")}} object.
## Examples
```js
navigator.mediaCapabilities
.decodingInfo({
type: "file",
audio: {
contentType: "audio/mp3",
channels: 2,
bitrate: 132700,
samplerate: 5200,
},
})
.then((result) => {
console.log(
`This configuration is ${result.supported ? "" : "not "}supported,`,
);
console.log(`${result.smooth ? "" : "not "}smooth, and`);
console.log(`${result.powerEfficient ? "" : "not "}power efficient.`);
});
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Media Capabilities API](/en-US/docs/Web/API/Media_Capabilities_API)
- {{domxref("WorkerNavigator")}}
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/gpu/index.md | ---
title: "WorkerNavigator: gpu property"
short-title: gpu
slug: Web/API/WorkerNavigator/gpu
page-type: web-api-instance-property
status:
- experimental
browser-compat: api.WorkerNavigator.gpu
---
{{APIRef("Web Workers API")}}{{SeeCompatTable}}{{SecureContext_Header}}
The **`gpu`** read-only property of the {{domxref("WorkerNavigator")}} interface returns the {{domxref("GPU")}} object for the current worker context, which is the entry point for the {{domxref("WebGPU_API", "WebGPU API", "", "nocode")}}.
## Value
A {{domxref("GPU")}} object.
## Examples
```js
// Can be run inside a web worker
async function init() {
if (!navigator.gpu) {
throw Error("WebGPU not supported.");
}
const adapter = await navigator.gpu.requestAdapter();
if (!adapter) {
throw Error("Couldn't request WebGPU adapter.");
}
const device = await adapter.requestDevice();
//...
}
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{domxref("WebGPU_API", "WebGPU API", "", "nocode")}}
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data/mdn-content/files/en-us/web/api/workernavigator | data/mdn-content/files/en-us/web/api/workernavigator/setappbadge/index.md | ---
title: "WorkerNavigator: setAppBadge() method"
short-title: setAppBadge()
slug: Web/API/WorkerNavigator/setAppBadge
page-type: web-api-instance-method
browser-compat: api.WorkerNavigator.setAppBadge
---
{{APIRef("Badging API")}}{{securecontext_header}}
The **`setAppBadge()`** method of the {{domxref("WorkerNavigator")}} interface sets a badge on the icon associated with this app. If a value is passed to the method, this will be set as the value of the badge. Otherwise the badge will display as a dot, or other indicator as defined by the platform.
## Syntax
```js-nolint
setAppBadge()
setAppBadge(contents)
```
### Parameters
- `contents` {{optional_inline}}
- : A {{jsxref("number")}} which will be used as the value of the badge. If `contents` is `0` then the badge will be set to `nothing`, indicating a cleared badge.
### Return value
A {{jsxref("Promise")}} that resolves with {{jsxref("undefined")}}.
### Exceptions
- `InvalidStateError` {{domxref("DOMException")}}
- : Thrown if the document is not fully active.
- `SecurityError` {{domxref("DOMException")}}
- : Thrown if the call was blocked by the [same-origin policy](/en-US/docs/Web/Security/Same-origin_policy).
- `NotAllowedError` {{domxref("DOMException")}}
- : Thrown if {{domxref('PermissionStatus.state')}} is not `granted`.
## Examples
In the example below an unread count is passed to `setAppBadge()`. The badge should then display `30`.
```js
const unread = 30;
navigator.setAppBadge(unread);
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Badging for app icons](https://developer.chrome.com/docs/capabilities/web-apis/badging-api/)
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