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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.
Nothing in yet

Paste, drop, or type to begin. Everything stays on this device.

live probes run after hydration — the prerendered page carries only the dated snapshot text

Next door in Browser

- Capability dashboard (/browser/capabilities)
- Format support (/images/format-support)
All browser tools (/browser)

Canonical HTML: https://nutter.tools/browser/feature-support
Markdown version: https://nutter.tools/browser/feature-support/index.md
Plain-text version: https://nutter.tools/browser/feature-support/index.txt
Agent index: https://nutter.tools/llms.txt