Convert modern CSS into something browsers understand
Standard Subresource Integrity library -- parses, serializes, generates, and verifies integrity metadata according to the SRI spec.
Use Custom Properties Queries in CSS
Use Custom Media Queries in CSS
Nest style rules inside each other
Use Custom Selectors in CSS
List of standard SVG tags.
List of standard HTML tags
Use 4 & 8 character hex color notation in CSS
An implementation of WHATWG EventTarget interface.
Use the gray() color function in CSS
List of known HTML tag-names
List of known MathML tag-names
List of known SVG tag-names
A stand-alone working lightweight version of the W3C Custom Elements specification
Map of HTML elements to allowed attributes
Map of web namespaces
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