As with CSS, there are broadly two ways to add a (JavaScript) script to your HTML page.

The first, is to reference the URL of the script as follows:

```
<script src="path-to-your-javascript-file/script.js"></script>
```

The second is to directly include the script  as part of the HTML by inserting it between script tags as follows:

```
<script>
// Your code here
</script>
```

Do note if you intend to include custom code in more than one script tag on a single page, it is important to have a good understanding of JavaScript scoping rules, as global variables declared in one script tag can overwrite variables declared in another.
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