Documentation · ESSENTIAL
MDN Web Docs
A dependable reference for HTML, CSS, JavaScript and the browser APIs that bring them together.
developer.mozilla.org THE WEB, WELL BOOKMARKED
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98 references, libraries and tools for designing, building and testing the web.
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Documentation · ESSENTIAL
MDN HTML reference
HTML elements, attributes, forms and document structure, with reference material and browser notes.
developer.mozilla.orgDocumentation
HTML Living Standard
The maintained HTML specification from WHATWG, covering the language and browser processing rules.
html.spec.whatwg.orgDocumentation
Open Graph protocol
The Open Graph protocol reference, including the basic metadata fields used by sharing platforms.
ogp.me