HTML, CSS, JS Compiler

Create, debug, share and run HTML code online.

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Online HTML Compiler Features

Multi-Language Web Editor

  • Monaco Editor with simultaneous syntax highlighting for HTML, CSS, and JavaScript
  • Intelligent autocomplete for HTML5 tags, CSS properties, and JavaScript methods
  • Real-time validation catches malformed HTML tags, CSS syntax errors, and JavaScript mistakes
  • Tag matching and auto-closing help write well-structured HTML documents

Full Web Page Execution

  • Write complete HTML pages with embedded CSS styles and JavaScript code
  • JavaScript extraction executes your script tags showing console.log output
  • Test responsive layouts, form structures, and semantic HTML5 elements instantly
  • Perfect for web development beginners learning how HTML, CSS, and JS work together

HTML5 & Modern Standards

  • Use semantic HTML5 tags: header, nav, main, section, article, aside, footer
  • Test form elements, input validation, and HTML attributes without browser setup
  • Experiment with CSS styling, flexbox, grid, and modern layout techniques
  • Practice JavaScript DOM manipulation patterns in complete HTML documents

Web Development Education

  • Ideal for learning web development fundamentals in an integrated environment
  • Share complete web page examples for tutorials, documentation, or teaching
  • Test HTML structure, CSS styling, and JavaScript behavior together
  • Practice responsive design, accessibility, and modern web standards
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HTML Compiler Keyboard Shortcuts

Shortcut Action Description
Ctrl + Enter Run HTML Code Extract and execute JavaScript from HTML
Ctrl + S Save Web Page Create shareable link for complete HTML document
Ctrl + / Toggle Comment Comment HTML, CSS, or JS depending on context
Shift + Alt + F Format Document Auto-format HTML, CSS, and JavaScript
Ctrl + Shift + K Delete Line Remove current line from HTML code
Alt + Up/Down Move Line Reorder HTML elements or style rules

Pro Tips

  • Use console.log() inside

    This entire HTML compiler was built by Replit Agent 3 from a natural language prompt. Replit's environment facilitates rapid development, iteration and testing code for users of any technical ability. Develop software faster and better with Replit’s autonomous AI.

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Frequently Asked Questions

Does this HTML compiler render web pages visually?

This HTML compiler extracts and executes JavaScript from