PluginStats
HTML & CSS W3C Validator Pro users statistics
By Rocco Caruso · Chrome Web Store · Developer Tools
Advanced validator that extracts, merges, and validates HTML/CSS (including external styles) via W3C standards.
HTML & CSS W3C Validator Pro has approximately 197 recorded users on Chrome Web Store, ranking #2542 of 3,404 tracked listings.
Rating: 4.40 / 5 from 5 ratings
About HTML & CSS W3C Validator Pro
Advanced validator that extracts, merges, and validates HTML/CSS (including external styles) via W3C standards.
HTML & CSS W3C Validator Pro 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 streamlines the debugging process by sending your page's code directly to the official W3C Validators, eliminating the need for manual copy-pasting.
Unlike basic tools, this extension is built for the modern web: it handles dynamic DOM states, external frameworks, and complex stylesheets effortlessly.
🚀 KEY FEATURES Advanced HTML5 Validation: Captures the current state of your DOM, including elements generated dynamically by JavaScript. Smart CSS Validation (Pro): Overcomes CORS restrictions to analyze stylesheets that standard validators often miss. Merge & Validate: Automatically fetches all internal and external styles (including CDNs like Bootstrap or Tailwind), merging them into a single block for a complete audit. Used CSS Analysis: Focus on efficiency by extracting and validating only the rules currently affecting elements on your page. Source Validation: Ideal for checking raw .css files or the direct page source in the browser.
👨💻 DEVELOPER-CENTRIC WORKFLOW Official Standards: Direct integration with validator.w3.org and jigsaw.w3.org. Visual Feedback: Provides immediate status indications and cursor updates while processing complex data. Privacy-Focused: Built on Manifest V3 with no tracking or ads; your code is only sent to W3C servers for analysis. Secure Execution: Utilizes safe fetching methods to protect user privacy while retrieving external assets.
🎯 IDEAL FOR Web Developers: Identify unclosed tags, invalid attributes, and CSS syntax errors during production. SEO Specialists: Ensure semantic markup is valid to improve search engine crawling. Accessibility Experts: Verify code structure to maintain compatibility with screen readers. QA Testers: Streamline technical audits for complex, framework-heavy applications.
Start writing higher-quality code today. Install HTML & CSS W3C Validator Pro.
Description from the Chrome Web Store listing.
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Charts
Images: 30d · 1y · all time · 1600×900 dark
Adoption over time
7/30/90-day growth
Ranking history
Ratings over time
Listing placement
Listing placement
Filled points are observed values; hollow points come from Internet Archive snapshots of the listing page. Dashed segments span periods with no observations — values between points are not interpolated.
Each band is one page of 20. Users on a linear scale. Placement is projected from users, so it can differ from the marketplace's own sort order. Hover a dot to see the listing.
Recent observations
Full history (1)Similar Chrome Web Store Developer Tools plugins
All 20 HTML & CSS W3C Validator Pro alternatives
Data source
Covers every Chrome Web Store extension with at least 100 users, found through the store's public sitemap. User counts are read from public listing pages. The 10% most-used extensions are refreshed daily, the next 40% weekly and the next 40% monthly; the least-used 10% are not refreshed. Google displays rounded user counts (and caps the display at 10,000,000+), so small changes may not be visible. Rating counts above 1,000 are rounded (e.g. 1.6K).
Listing: https://chromewebstore.google.com/detail/html-css-w3c-validator-pr/gbcbpmopobamggpanijecbdljcgolhof. First seen Oct 22, 2026; last successful collection Oct 22, 2026. See the methodology.