Skip to main content

Explore Popular Newest Categories

Search extensions

ExtensionWatch

© 2026 ExtensionWatch. Technical market intelligence.

Explore

Popular Newest Categories Stores

Stores

Chrome Edge Firefox

Legal

Privacy Policy Legal Notice Terms of Service

CSS validator icon

CSS validator

Use w3c css validator online to validate CSS by this CSS checker tool faster than pronouncing invalid property value CSS

Screenshots from Chrome Web Store

Store metrics

Chrome Web Store

Users: 416
Rating: 4,0
Reviews: 3

Website links

https://cssvalidator.app https://docs.google.com/document/d/1zu0E28mlv4o-_wsTzyHjgZz6IOUqbGGUwAk1w_5CVaE/edit?usp=sharing

Discovery

GoFullPage - Full Page Screen Capture

Users: 11m
Rating: 4,9
Reviews: 84,700

React Developer Tools

Users: 5m
Rating: 3,5
Reviews: 1,600

ColorZilla

Users: 4m
Rating: 4,7
Reviews: 3,900

Take Webpage Screenshots Entirely - FireShot

Users: 3m
Rating: 4,9
Reviews: 52,900

WhatFont

Users: 3m
Rating: 3,8
Reviews: 2,100

Wappalyzer - Technology profiler

Users: 3m
Rating: 4,0
Reviews: 2,000