CSS:- Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g., fonts, colors, spacing) to Web documents.
These pages contain information on how to learn and use CSS and on available software. They also contain news from the CSS working group.
As mentioned on another thread here, this validator is better for HTML5: html5.validator. nu
But these days, they give about the same information.
Some of the validation errors on CSS are because a theme needs to include strange CSS for older browsers to get the same results as newer browsers.
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