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. htmlmarqueeelement api: direction

  7. idbcursor api: direction

  8. idbindex api: getallkeys: object as parameter: `direction` property

  9. idbindex api: getall: object as parameter: `direction` property

  10. idbobjectstore api: getallkeys: object as parameter: `direction` property

  11. idbobjectstore api: getall: object as parameter: `direction` property

  12. offscreencanvasrenderingcontext2d api: direction

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

  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 `readablestream`)

  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. xrray api: direction

  31. css property: animation-direction

  32. css property: animation-direction: alternate

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

  34. css property: animation-direction: normal

  35. css property: animation-direction: reverse

  36. css property: box-direction

  37. css property: direction

  38. css property: direction: ltr

  39. css property: direction: rtl

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

  41. css property: flex-direction

  42. css property: flex-direction: column

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

  44. css property: flex-direction: row

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

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

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

  48. html element: marquee: direction

  49. global_attributes: direction