What is Baseline?

Web Platform Baseline is a cross-browser support standard defined by the W3C WebDX Community Group. It is an official baseline agreed upon by Google, Apple, Mozilla, and Microsoft, and is adopted by MDN, Can I use, and web.dev.

This site classifies every HTML and CSS feature by its Baseline status so you can answer "can I use this in production today?" at a glance.

Three statuses

"Major browsers" refers to Chrome, Edge, Firefox, and Safari.

  • Widely available

    Supported in all major browsers and 30+ months since the last one shipped it. Safe for production use.

  • Newly available

    Supported in all major browsers, but less than 30 months old. Provide a fallback for users on older versions.

  • Limited support

    Only some browsers support the feature. Use cautiously in production.

Why use Baseline as your criterion

  • Clear yes / no — Widely → ship it. Limited → think twice. The decision is mechanical.
  • Industry standard — An agreement between Google, Apple, Mozilla, and Microsoft.
  • Less team debate — Adopt one rule like "Baseline Widely is OK" and stop relitigating per-feature.

References