Standard Subresource Integrity library -- parses, serializes, generates, and verifies integrity metadata according to the SRI spec.
Convert modern CSS into something browsers understand
Nest style rules inside each other
List of standard HTML tags
List of standard SVG 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 MathML tag-names
A stand-alone working lightweight version of the W3C Custom Elements specification
Map of web namespaces
List of known SVG tag-names
List of known HTML tag-names
List of known void HTML elements
Map of HTML elements to allowed attributes
An implementation of WHATWG AbortController interface.
A Gulp wrapper for w3cjs to validate your HTML
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