> For the complete documentation index, see [llms.txt](https://web-dev-guide.wishtack.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://web-dev-guide.wishtack.io/dom/what-is-it.md).

# 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>
```