HTML & CSS W3C Validator Pro

Validatore avanzato che estrae, unisce e valida HTML/CSS (inclusi stili esterni) tramite standard W3C.

Ensure your code meets World Wide Web Consortium (W3C) standards with a single click. Developing clean, standards-compliant websites is essential for SEO, accessibility, and cross-browser compatibility. This extension simplifies the debugging process by sending your page's code directly to the official W3C Validators, eliminating the need to manually copy and paste code. Unlike standard validators, this tool is designed for modern web development: it handles dynamic content, external frameworks, and complex stylesheets effortlessly. 🚀 KEY FEATURES: 1. Advanced HTML5 Validation Validate the current state of your DOM. Unlike basic "view source" validators, this extension captures the generated HTML (including changes made by JavaScript), ensuring you are validating what the user actually sees. 2. Smart CSS Validation (Pro Features) Most validators fail when your site uses external libraries (like Bootstrap, Tailwind, or Google Fonts) due to CORS security restrictions. We solved this: Merge & Validate: The extension automatically fetches all internal and external stylesheets (CDNs), merges them into a single block, and validates the complete CSS. "Used CSS" Mode: Want to focus on clean code? This mode extracts and validates only the CSS rules currently affecting elements on the page, helping you identify unused styles and reduce bloat. Source Validation: Perfect for checking raw .css files directly in the browser. 3. Seamless Workflow Visual Feedback: Immediate status indication while processing complex files. Official Standards: Connects directly to validator.w3.org and jigsaw.w3.org. Privacy First: Built with Manifest V3. No tracking, no ads, and your code is only sent to the W3C validator for analysis. 👨‍💻 WHY USE THIS EXTENSION? Fix Errors Faster: Identify unclosed tags, invalid attributes, and CSS syntax errors instantly. Boost SEO: Search engines prefer valid, semantic markup. Improve Accessibility: Ensure your site is readable by screen readers and assistive technologies. Perfect for: Web Developers, QA Testers, SEO Specialists, and Students learning web standards. Start writing better code today. Install HTML & CSS W3C Validator.