You can add javascript to your HTML page by using the script tag like so:

```
<script>
/* Your javascript goes here */
</script>
```

The script tag can be added within either the `<head>` tags (which will load the script before all content), or within the `<body>` tags, which will load the script after the content above it has been rendered. 

It is also possible to use the script tag to link to an external javascript file like so:

```
 <script src="myScript.js"></script> 
```
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