# What Is It?

When an HTML page is loaded, the browser **parses** it and **generates the Document Object Model (DOM)**.

The DOM is a **tree-structure of nodes** where **each node is an element** *(like a form, an image or a simple `div` container)*.

DOM can be manipulated with JavaScript using the **standard DOM API**.

When the HTML page is loaded, the browser executes the JavaScript indicated using the `script` tag.

```markup
<script>
    alert('test');
</script>

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


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