1. classList (DOMTokenList)

    Method of easily manipulating classes on elements, using the `DOMTokenList` object.

  2. Basic console logging functions

    Method of outputting data to the browser's console, intended for development purposes.

  3. Ogg Vorbis audio format

    Vorbis is a free and open source audio format, most commonly used with the Ogg container.

  4. Ogg/Theora video format

    Free lossy video compression format.

  5. Proxy object

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

  6. CSS3 3D Transforms

    Method of transforming an element in the third dimension using the `transform` property. Includes support for the `perspective` property to set the perspective in z-space and the `backface-visibility` property to toggle display of the reverse side of a 3D-transformed element.

  7. domtokenlist api: toggle

  8. domtokenlist api: toggle: `force` parameter

  9. element api: toggleattribute

  10. htmlelement api: `beforetoggle` event

  11. htmlelement api: `beforetoggle` event: `beforetoggle` event fires at dialog elements

  12. htmlelement api: `beforetoggle` event: `beforetoggle` event fires at popover elements

  13. htmlelement api: togglepopover

  14. htmlelement api: togglepopover: returns `true` or `false`

  15. htmlelement api: togglepopover: `source` option

  16. htmlelement api: togglepopover: `source` option: implicit anchor reference via `source`

  17. htmlelement api: `toggle` event

  18. htmlelement api: `toggle` event: `toggle` event fires at details elements

  19. htmlelement api: `toggle` event: `toggle` event fires at dialog elements

  20. htmlelement api: `toggle` event: `toggle` event fires at popover elements

  21. mediasession api: `setactionhandler()`: `"togglecamera"` type

  22. mediasession api: `setactionhandler()`: `"togglemicrophone"` type

  23. toggleevent api

  24. toggleevent api: newstate

  25. toggleevent api: oldstate

  26. toggleevent api: `toggleevent()` constructor

  27. headers http header: `service-worker` request header for logging service worker script resource requests.