Syntax Checker & Code Validator
About HTML DOM Tree Viewer
The HTML DOM Tree & Node Hierarchy Visualizer parses HTML markup into an interactive Document Object Model (DOM) tree, displaying element nodes, text nodes, attributes, node depths, and CSS child selectors.
How to Use HTML DOM Tree Viewer
Step 1
Paste HTML markup into the input editor.
Step 2
Navigate the interactive DOM tree on the right.
Step 3
Click any element node to copy its unique CSS selector or XPath string.
Practical Use Cases for HTML DOM Tree Viewer
Web Scraping & CSS Selector Path Construction
Inspect HTML document hierarchies to construct precise CSS selectors (e.g. `div.container > ul > li:nth-child(2)`) for Playwright and Cheerio scrapers.
Debugging Malformed HTML DOM Hierarchy
Visualize how web browsers parse and reconstruct invalid or unclosed HTML tags into browser DOM trees.
Input & Output Examples
Visualizing DOM Tree for Sample Card
`<article class="card"><h2>Title</h2><p>Body</p></article>`
DOM Tree: `ARTICLE.card` $\\rightarrow$ [`H2` (Text: "Title"), `P` (Text: "Body")] | Click to copy Unique CSS Selector: `article.card > h2`
Key Features & Performance
- ✓Interactive expandable/collapsible DOM node hierarchy diagram.
- ✓Displays node attributes (classes, IDs, data-attributes, aria tags) and node types.
- ✓1-Click "Copy Unique CSS Selector" and "Copy XPath" for any selected DOM node.
- ✓100% Client-Side memory execution via native DOMParser.
- ✓1-Click Copy DOM tree structure.
Key Terminology & Definitions
DOM (Document Object Model)
A cross-platform object-oriented representation of an HTML document representing each element, attribute, and text piece as a node in a tree.
XPath
A syntax for defining parts of an XML/HTML document, used in web automated testing (Selenium, Puppeteer) to locate UI elements.