Google's John Mueller was asked if Google "looks at "CSS .Class" to comprehend the structure of a page; or a section of content that clarifies its SERP Features." John responded on Twitter saying "not ...

This repository demonstrates a subtle bug in CSS where an unexpected space before the opening curly brace of a ':checked' selector prevents it from functioning correctly. The ':checked' pseudo-class ...

In CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, plus the hyphen (-) and the ...