These ones:

    Web Bluetooth
    Web MIDI API
    Magnetometer API
    Web NFC API
    Device Memory API
    Network Information API
    Battery Status API
    Ambient Light Sensor
    HDCP Policy Check extension for EME
    Proximity Sensor
    WebHID
    Serial API
    Web USB
    Geolocation Sensor (background geolocation)
    User Idle Detection

Note: I do understand Apple's privacy concerns with some or even most of them. But most of these are obviously necessary if you want to turn the browser into the main application platform, for better and for worse.