1. :dir() CSS pseudo-class

    Matches elements based on their directionality. `:dir(ltr)` matches elements which are Left-to-Right. `:dir(rtl)` matches elements which are Right-to-Left.

  2. CSS writing-mode property

    Property to define whether lines of text are laid out horizontally or vertically and the direction in which blocks progress.

  3. 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`.

  4. Web Sockets

    Bidirectional communication technology for web apps

  5. canvasrenderingcontext2d api: direction

  6. htmlinputelement api: selectiondirection

  7. htmlmarqueeelement api: direction

  8. htmltextareaelement api: selectiondirection

  9. idbcursor api: direction

  10. offscreencanvasrenderingcontext2d api: direction

  11. rtcpeerconnection api: addtransceiver: `init.direction` parameter

  12. rtcrtptransceiver api: currentdirection

  13. rtcrtptransceiver api: currentdirection: `"stopped"` value

  14. rtcrtptransceiver api: direction

  15. rtcrtptransceiver api: direction: `"stopped"` value

  16. selection api: direction

  17. usbendpoint api: direction

  18. webtransportbidirectionalstream api

  19. webtransportbidirectionalstream api: readable

  20. webtransportbidirectionalstream api: readable: returns `webtransportreceivestream` (earlier spec returned `writablestream`)

  21. webtransportbidirectionalstream api: writable

  22. webtransportbidirectionalstream api: writable: returns `webtransportsendstream` (earlier spec returned `writablestream`)

  23. webtransport api: createbidirectionalstream

  24. webtransport api: createbidirectionalstream: `options.sendorder` parameter

  25. webtransport api: createunidirectionalstream

  26. webtransport api: createunidirectionalstream: byob reader support

  27. webtransport api: createunidirectionalstream: `options.sendorder` parameter

  28. webtransport api: incomingbidirectionalstreams

  29. webtransport api: incomingunidirectionalstreams

  30. xrlightestimate api: primarylightdirection

  31. xrray api: direction

  32. css property: animation-direction

  33. css property: animation-direction: alternate

  34. css property: animation-direction: alternate-reverse

  35. css property: animation-direction: normal

  36. css property: animation-direction: reverse

  37. css property: box-direction

  38. css property: direction

  39. css property: direction: ltr

  40. css property: direction: rtl

  41. css property: direction: control direction of vertical range sliders, meters, and progress bars

  42. css property: flex-direction

  43. css property: flex-direction: column

  44. css property: flex-direction: column-reverse

  45. css property: flex-direction: row

  46. css property: flex-direction: row-reverse

  47. types: `<easing-function>`: `steps()` with `start`, `end` or no direction

  48. types: `<easing-function>`: `steps()` with `start`, `end` or no direction: `jump-` keywords for `steps()`

  49. html element: marquee: direction

  50. global_attributes: direction