```yaml
product: AlterLab
title: "DOM (Document Object Model) — Web Scraping Glossary | AlterLab"
comparison_context: "AlterLab is an alternative to Firecrawl, ScrapingBee, and Bright Data."
source_url: https://alterlab.io/glossary/dom
```

browser

# DOM (Document Object Model)

The tree-structured programmatic representation of a web page that JavaScript manipulates to create dynamic content.

The Document Object Model (DOM) is the programming interface for HTML and XML documents — an in-memory tree representation of the page structure that JavaScript can read and modify. Every HTML element becomes a node in the DOM tree; scripts can add, remove, or change nodes to update what the user sees without reloading the page.

The DOM is central to modern web scraping because JavaScript-rendered pages build all their content by manipulating the DOM after the initial HTML load. A React or Vue application receives a near-empty HTML document, executes its JavaScript bundle, fetches data via API calls, and then calls DOM APIs (`document.createElement`, `element.appendChild`, `element.textContent = ...`) to build the visible page. A headless browser that executes this JavaScript produces a fully populated DOM; a plain HTTP request produces only the empty shell.

For scraping, the DOM is the extraction target — the source of data after all JavaScript has executed. CSS selectors and XPath expressions operate on the DOM to locate specific nodes. Browser DevTools provide a live DOM inspector that is invaluable for identifying the correct selector path to target data on any page.

### What is DOM (Document Object Model)?

The tree-structured programmatic representation of a web page that JavaScript manipulates to create dynamic content.

### How does AlterLab handle DOM (Document Object Model)?

For scraping, the DOM is the extraction target — the source of data after all JavaScript has executed. CSS selectors and XPath expressions operate on the DOM to locate specific nodes. Browser DevTools provide a live DOM inspector that is invaluable for identifying the correct selector path to target data on any page.

## Related Terms

[JavaScript RenderingThe process of executing a page's JavaScript in a browser engine before extracting content, required for React, Vue, and Angular SPAs.](https://alterlab.io/glossary/javascript-rendering)[Headless BrowserA web browser that runs without a graphical user interface, executing JavaScript and rendering pages exactly as a real browser would.](https://alterlab.io/glossary/headless-browser)[Dynamic ContentPage content generated client-side by JavaScript after the initial HTML is served, requiring a browser engine to render.](https://alterlab.io/glossary/dynamic-content)[CSS SelectorA pattern used to match HTML elements by tag, class, ID, or attribute, used in web scraping to extract specific nodes from parsed HTML.](https://alterlab.io/glossary/css-selector)[XPathXML Path Language — a query syntax for selecting nodes in HTML or XML using path expressions, more expressive than CSS selectors for complex traversals.](https://alterlab.io/glossary/xpath)

## Extract DOM (Document Object Model) data from any website

AlterLab returns clean, structured data from any public URL — no scraper infrastructure needed. Start free, no credit card required.

[View API docs](https://alterlab.io/docs/api/rest)

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