New checker for https://whatwg.org/validator/ #413
Description
CSS HTML Validator has been around since 1997.
Please add to https://whatwg.org/validator/ .
It's not an online checker, but an offline one for Windows. There is also now a Linux and Mac command line tool.
Web site: https://www.htmlvalidator.com/
Linux tool: https://www.htmlvalidator.com/css-html-validator-for-linux.php
Mac tool: https://www.htmlvalidator.com/css-html-validator-for-mac.php
Thank you.