1. CSS display: contents

    `display: contents` causes an element's children to appear as if they were direct children of the element's parent, ignoring the element itself. This can be useful when a wrapper element should be ignored when using CSS grid or similar layout techniques.

  2. CSS font-display

    `@font-face` descriptor `font-display` that allows control over how a downloadable font renders before it is fully loaded.

  3. CSS Table display

    Method of displaying elements as tables, rows, and cells. Includes support for all `display: table-*` properties as well as `display: inline-table`

  4. CSS Flexible Box Layout Module

    Method of positioning elements in horizontal or vertical stacks. Support includes all properties prefixed with `flex`, as well as `display: flex`, `display: inline-flex`, `align-content`, `align-items`, `align-self`, `justify-content` and `order`.

  5. display: flow-root

    The element generates a block container box, and lays out its contents using flow layout. It always establishes a new block formatting context for its contents. It provides a better solution to the most use cases of the "clearfix" hack.

  6. display: run-in

    If the run-in box contains a block box, same as block. If a block box follows the run-in box, the run-in box becomes the first inline box of the block box. If an inline box follows, the run-in box becomes a block box.

  7. Web Animations API

    Lets you create animations that are run in the browser, as well as inspect and manipulate animations created through declarative means like CSS.

  8. animation api: play

  9. animation api: playbackrate

  10. animation api: playstate

  11. audiobuffersourcenode api: playbackrate

  12. audiocontext api: playbackstats

  13. audioprocessingevent api: playbacktime

  14. gamepadhapticactuator api: playeffect

  15. gamepadhapticactuator api: playeffect: `params.lefttrigger` parameter

  16. gamepadhapticactuator api: playeffect: `params.righttrigger` parameter

  17. gamepadhapticactuator api: playeffect: `trigger-rumble` effect type

  18. htmlmediaelement api: play

  19. htmlmediaelement api: playbackrate

  20. htmlmediaelement api: playbackrate: negative `playbackrate` (backwards playback)

  21. htmlmediaelement api: played

  22. htmlmediaelement api: `playing` event

  23. htmlmediaelement api: `play` event

  24. htmlmediaelement api: play: returns a `promise`

  25. htmlvideoelement api: playsinline

  26. mediacontroller api: play

  27. mediacontroller api: playbackrate

  28. mediacontroller api: playbackstate

  29. mediacontroller api: played

  30. mediasession api: playbackstate

  31. rtcstatsreport api: `media-playout` stats

  32. rtcstatsreport api: `media-playout` stats: `id` in 'media-playout' stats

  33. rtcstatsreport api: `media-playout` stats: `kind` in 'media-playout' stats

  34. rtcstatsreport api: `media-playout` stats: `synthesizedsamplesduration` in 'media-playout' stats

  35. rtcstatsreport api: `media-playout` stats: `synthesizedsamplesevents` in 'media-playout' stats

  36. rtcstatsreport api: `media-playout` stats: `timestamp` in 'media-playout' stats

  37. rtcstatsreport api: `media-playout` stats: `totalsamplescount` in 'media-playout' stats

  38. rtcstatsreport api: `media-playout` stats: `totalsamplesduration` in 'media-playout' stats

  39. rtcstatsreport api: `media-playout` stats: `type` in 'media-playout' stats

  40. css property: animation-play-state

  41. css property: animation-play-state: paused

  42. css property: animation-play-state: running

  43. css selector: `:playing`

  44. html element: video: playsinline