A few more features

[geofft]

• Screen sharing via getDisplayMedia, analogous to getUserMedia for cameras.

• WebRTC, peer-to-peer connections.

• Security keys (WebAuthn), specific support for cheap ($10-$50 depending on features) devices that do second-factor login to websites. Importantly, these devices communicate with the browser about which site you're logging into, making for phishing-proof logins.

[krmax44]

The Web MIDI API also deserves some love

[itsaphel]

Adding on Webauthn: on Macs this can be used for Touch ID authentication (using the in-built sensor). So don't necessarily need a Yubikey or something.

If Apple develops Safari a bit, this could feasibly allow for Face ID authentication on iPhones/iPads. Similar for Android phones, too, I suppose.

So it's a pretty powerful API.