Your files stay on your device
Feature support: the baseline vs this browser
A capped, dated snapshot of web-platform features, each row checked live in this tab, so you see what the baseline said AND what your browser actually has.
snapshot 2026-08-24
Probing live after hydration. The snapshot below is pinned data; the live column fills in from this browser.
- The baseline column is a hand-curated snapshot: 20 features, pinned 2026-08-24, hand-curated from mdn browser-compat-data and web-features baseline knowledge, pinned in-repo (not a live bcd build). It is not the full browser-compat dataset and does not pretend to be.
- Every row is re-measured live: the probe each row uses is printed on the row itself (e.g. CSS.supports("selector(:has(a))")), so you can audit the check, not trust it.
- Disagreements are the point: "this browser is BEHIND the pinned baseline" is exactly the signal a compatibility table averages away, and "AHEAD" marks where this browser is earlier than the Baseline tier suggests.
- WebAssembly is the sanity row: a Baseline-since-2017 feature reading absent would mean the probe machinery broke, not that your browser lost WASM.
Paste, drop, or type to begin. Everything stays on this device.