message: Document how to send cookies
diff: @@ -128,7 +128,7 @@ var opt = {
  | `renderer` | String | The renderer to use for the view. One of `"canvas"` (default) or `"svg"`. See [Vega docs](https://vega.github.io/vega/docs/api/view/#view_renderer) for details. |
  | `logLevel` | Level | Sets the current log level. See [Vega docs](https://vega.github.io/vega/docs/api/view/#view_logLevel) for details. |
  | `tooltip` | Handler or Boolean or Object | Provide a [tooltip handler](https://vega.github.io/vega/docs/api/view/#view_tooltip), customize the default [Vega Tooltip](https://github.com/vega/vega-tooltip) handler, or disable the default handler. |
  -| `loader` | Loader / Object | Sets a custom Vega loader or pass in loader options. See [Vega docs](https://vega.github.io/vega/docs/api/view/#view) for details. |
  +| `loader` | Loader / Object | _Loader_ : Sets a custom Vega loader. _Object_ : Vega loader options for a loader that will be created. <br> See [Vega docs](https://vega.github.io/vega/docs/api/view/#view) for details. |
  | `onBeforeParse`| Function | A callback function that can modify an input specification before it is parsed.|
  | `width` | Number | Sets the view width in pixels. See [Vega docs](https://vega.github.io/vega/docs/api/view/#view_width) for details. Note that Vega-Lite overrides this option. |
  | `height` | Number | Sets the view height in pixels. See [Vega docs](https://vega.github.io/vega/docs/api/view/#view_height) for details. Note that Vega-Lite overrides this option. |
  @@ -142,6 +142,12 @@ var opt = {
  | `hover` | Boolean | Enable [hover event processing](https://vega.github.io/vega/docs/api/view/#view_hover). |
  | `runAsync` | Boolean | Use [`runAsync`](https://vega.github.io/vega/docs/api/view/#view_runAsync) instead of [`run`](https://vega.github.io/vega/docs/api/view/#view_run). |
  +## Common questions
  +
  +### How do I send cookies when loading data?
  +
  +By default, the Vega loader does not send the credentials of the current page with requests. You can override this behavior by passing `{loader: { http: { credentials: 'same-origin' }}}` as the embed option.
  +
  ## Build Process
  To build `vega-embed.js` and view the test examples, you must have [yarn](https://yarnpkg.com/en/) installed.
  