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HTML & CSS W3C Validator Pro

Chrome extension by Rocco Caruso · Productivity · Developer

A Chrome extension in Productivity · Developer with 392 users, barely installed. Audience over the last 30 days: +227.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 3 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
392
Rating
4.4 (5 ratings)
Users, last 30 days
+227
Rating, last 30 days
Steady over 30 days
Version
1.6
Updated in the store
2026-10-23
Published
2026-02-01
Manifest
V3
Browser access
4 permissions, 3 site patterns

How it has moved

Users
+227 since 30.09
165-392 · 15 readings
2026-10-23: released 1.6
  1. 2026-10-04175
  2. 2026-10-08177
  3. 2026-10-09179
  4. 2026-10-10182
  5. 2026-10-11180
  6. 2026-10-16195
  7. 2026-10-17199
  8. 2026-10-18195
  9. 2026-10-20200
  10. 2026-10-21198
  11. 2026-10-22197
  12. 2026-10-24196
  13. 2026-10-25382
  14. 2026-10-29386
  15. 2026-10-30392
Rating
unchanged since 30.09
reviewsrating 4.40 · 15 readings
2026-10-23: released 1.6
  1. 2026-10-04reviews5rating4.40
  2. 2026-10-08reviews5rating4.40
  3. 2026-10-09reviews5rating4.40
  4. 2026-10-10reviews5rating4.40
  5. 2026-10-11reviews5rating4.40
  6. 2026-10-16reviews5rating4.40
  7. 2026-10-17reviews5rating4.40
  8. 2026-10-18reviews5rating4.40
  9. 2026-10-20reviews5rating4.40
  10. 2026-10-21reviews5rating4.40
  11. 2026-10-22reviews5rating4.40
  12. 2026-10-24reviews5rating4.40
  13. 2026-10-25reviews5rating4.40
  14. 2026-10-29reviews5rating4.40
  15. 2026-10-30reviews5rating4.40
Users
+220 since 01.09
148-392 · 28 readings
2026-10-23: released 1.6
  1. 2026-09-01172
  2. 2026-09-02178
  3. 2026-09-03174
  4. 2026-09-05166
  5. 2026-09-07165
  6. 2026-09-08151
  7. 2026-09-10148
  8. 2026-09-13159
  9. 2026-09-15162
  10. 2026-09-16165
  11. 2026-09-21168
  12. 2026-09-27163
  13. 2026-09-28165
  14. 2026-10-04175
  15. 2026-10-08177
  16. 2026-10-09179
  17. 2026-10-10182
  18. 2026-10-11180
  19. 2026-10-16195
  20. 2026-10-17199
  21. 2026-10-18195
  22. 2026-10-20200
  23. 2026-10-21198
  24. 2026-10-22197
  25. 2026-10-24196
  26. 2026-10-25382
  27. 2026-10-29386
  28. 2026-10-30392
Rating
unchanged since 01.09
reviewsrating 4.40 · 28 readings
2026-10-23: released 1.6
  1. 2026-09-01reviews5rating4.40
  2. 2026-09-02reviews5rating4.40
  3. 2026-09-03reviews5rating4.40
  4. 2026-09-05reviews5rating4.40
  5. 2026-09-07reviews5rating4.40
  6. 2026-09-08reviews5rating4.40
  7. 2026-09-10reviews5rating4.40
  8. 2026-09-13reviews5rating4.40
  9. 2026-09-15reviews5rating4.40
  10. 2026-09-16reviews5rating4.40
  11. 2026-09-21reviews5rating4.40
  12. 2026-09-27reviews5rating4.40
  13. 2026-09-28reviews5rating4.40
  14. 2026-10-04reviews5rating4.40
  15. 2026-10-08reviews5rating4.40
  16. 2026-10-09reviews5rating4.40
  17. 2026-10-10reviews5rating4.40
  18. 2026-10-11reviews5rating4.40
  19. 2026-10-16reviews5rating4.40
  20. 2026-10-17reviews5rating4.40
  21. 2026-10-18reviews5rating4.40
  22. 2026-10-20reviews5rating4.40
  23. 2026-10-21reviews5rating4.40
  24. 2026-10-22reviews5rating4.40
  25. 2026-10-24reviews5rating4.40
  26. 2026-10-25reviews5rating4.40
  27. 2026-10-29reviews5rating4.40
  28. 2026-10-30reviews5rating4.40

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

  • Attach to pages the way developer tools do debugger
  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
Show the remaining 1
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 1.6

What changed recently

  1. Package size changed
  2. Released version 1.6 (was 1.5)

The publisher

Rocco Caruso publishes 16 listings we track, 1k users between them.

  1. Browser Audio & Video Capture Rocco Caruso · Productivity · Tools · published 2026-04-05 335 users ★ 5.0
  2. Video Saver Rocco Caruso · Productivity · Tools · published 2026-03-16 245 users ★ 4.4
  3. Page & IFrame Analyzer Rocco Caruso · Productivity · Developer · published 2026-02-17 88 users ★ 5.0
Show 5 more from this publisher
  1. Page & Download Date Checker Rocco Caruso · Productivity · Developer · published 2026-03-10 46 users ★ 5.0
  2. Request Interceptor Pro Rocco Caruso · Productivity · Developer · published 2026-02-24 45 users ★ 5.0
  3. Cookie & UA Manager Rocco Caruso · Productivity · Developer · published 2026-02-03 43 users ★ 5.0
  4. Markdown Reader Rocco Caruso · Productivity · Developer · published 2026-09-25 30 users ★ 5.0
  5. Accessibility & Responsive Checker Rocco Caruso · Productivity · Developer · published 2026-02-14 29 users ★ 5.0

Like this one

Listings the catalog judges closest in what they say they do.

  1. HTML validator Describes nearly the same job, smaller audience 547 users ★ 5.0
  2. Validify Describes nearly the same job, smaller audience 101 users ★ 5.0
  3. HTML Validator Describes nearly the same job, smaller audience 2k users ★ 3.6
  4. HTML Validator — On-Device Describes nearly the same job, smaller audience 22 users ★ 5.0
  5. Rocket Validator HTML Guides Describes nearly the same job, smaller audience 23 users ★ 5.0

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

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Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/gbcbpmopobamggpanijecbdljcgolhof/badge.svg)](https://extops.dev/extensions/gbcbpmopobamggpanijecbdljcgolhof)

HTML

<a href="https://extops.dev/extensions/gbcbpmopobamggpanijecbdljcgolhof"><img src="https://extops.dev/extensions/gbcbpmopobamggpanijecbdljcgolhof/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>

Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-10-30. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built