HTML Validator
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Extension Delisted
This extension is no longer available in the official store. Delisted on 2025-09-16.
An extension to validate the webpage's html using a validation service
A small extension to validate the markup of current tab.
It can be used while developing the website to check for errors & maintain standards in your code. It sends the current tab's HTML to the https://validator.w3.org/ web service in order to check it for errors.
All the error found are displayed in a list to facilitate the refactoring of the code, the error part is highlighted & the source code is also displayed where the error is found
Latest reviews
I was looking for such a kind of extension and I'm lucky I found it. Great tool to debug w3 validation. Thank you!!!
Extension très utile, merci pour ton travail ^^ Very useful extension, thanks for your job :)
Not working with localhost (gulp server)
It seems to only print errors, would be great if it also showed warnings.
It works also with local html 👍🏻
First of 4 validation extensions what i tried that works
Effective and easy to use. I would love if it worked offline.
