Can confirm, it works on the web canary version. Though it doesn't seem to record all keys. Both keys I usually use for mute and deafen (F23 and F24) don't get recognized. Other and combinations work though. Might be a browser limitation?
Edit: Not a browser limitation. Also doesn't work on the dedicated client (Canary Desktop 2026.602.31138, Web 2026.605.11941, Windows 10 10.0.19045 (x64), Electron 41.2.2, Chrome 146.0.7680.188, Node 24.14.1, Locale en-US)
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Comment by @N3er0O