Reference cards for the open web platform
w3c.wiki is a community-edited encyclopedia of Web standards. Each entry links to the normative specification and shows what a conforming implementation looks like for end users — without vendor pitches and without commercial calls to action.
Browse by area
Recently verified
- ARIA tabs pattern
- CSS color-mix() and relative colour syntax
- CSS scroll-driven animations
- CSS @supports — feature queries
- The HTML <button> element
- <picture>, srcset, and responsive images
- HTML <table> for data, with accessible headers
- ResizeObserver: element-level layout reactivity
- structuredClone() and the structured-clone algorithm
- Core Web Vitals: LCP, INP, CLS