1. Accelerometer

    Defines `Accelerometer`, `LinearAccelerationSensor` and `GravitySensor` interfaces for obtaining information about acceleration applied to the X, Y and Z axis of a device that hosts the sensor.

  2. Battery Status API

    Method to provide information about the battery status of the hosting device.

  3. seamless attribute for iframes

    The seamless attribute makes an iframe's contents actually part of a page, and adopts the styles from its hosting page. The attribute has been removed from both [the WHATWG](https://github.com/whatwg/html/issues/331) and [the W3C](https://github.com/w3c/html/pull/325) HTML5 specifications.

  4. Proxy object

    The Proxy object allows custom behavior to be defined for fundamental operations. Useful for logging, profiling, object visualization, etc.

  5. Server Name Indication

    An extension to the TLS computer networking protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process.

  6. Vibration API

    Method to access the vibration mechanism of the hosting device.

  7. Web Share API

    A way to allow websites to invoke the native sharing capabilities of the host platform

  8. htmlanchorelement api: host

  9. htmlanchorelement api: hostname

  10. htmlareaelement api: host

  11. htmlareaelement api: hostname

  12. location api: host

  13. location api: hostname

  14. rtcpeerconnectioniceerrorevent api: hostcandidate

  15. shadowroot api: host

  16. urlpattern api: hostname

  17. url api: host

  18. url api: hostname

  19. workerlocation api: host

  20. workerlocation api: hostname

  21. css selector: `:host`

  22. css selector: `:host-context()`

  23. css selector: `:host()`

  24. headers http header: host