Markup Validator is a productivity chrome extension. it's a free extension , it has 24 active users since released its first version, it earns an average rating of 0.00 from 0 rated user, last update is 1099 days ago.
The extension is designed to check the markup of the current page or just any HTML code. Source code: https://github.com/w3lifer/crx-markup-validator
You could download the latest version crx file or older version files and install it.
English.
You could find more help information from markup validator support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of markup validator.
You could click to report abuse of markup validator.