Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as revert.
This issue is a false positive by the W3C validator, fixed in the latest versions of Nu Validator.
The value revert is indeed a valid value for the CSS property font-size.
Still checking your large sites one page at a time?
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.