1. CSS Animation

    Complex method of animating certain properties of an element

  2. CSS hanging-punctuation

    Allows some punctuation characters from start (or the end) of text elements to be placed "outside" of the box in order to preserve the reading flow.

  3. CSS Logical Properties

    Logical properties and values provide control of layout through logical, rather than physical, direction and dimension mappings. These properties are `writing-mode` relative equivalents of their corresponding physical properties.

  4. CSS Text Box

    CSS `text-box` (and its longhands `text-box-trim` & `text-box-edge`) provide the ability to trim extra space over/under text glyphs at the start/end of a block to match specific font-provided metrics. This allows for more precise alignment and positioning of text.

  5. Selection controls for input & textarea

    Controls for setting and getting text selection via `setSelectionRange()` and the `selectionStart` & `selectionEnd` properties.

  6. 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.

  7. editcontext api: characterboundsrangestart

  8. editcontext api: `compositionstart` event

  9. editcontext api: selectionstart

  10. htmltextareaelement api: selectionstart

  11. offlineaudiocontext api: startrendering

  12. offlineaudiocontext api: startrendering: returns a `promise`

  13. performancescripttiming api: executionstart

  14. svgtextcontentelement api: getstartpositionofchar

  15. svgtextpathelement api: startoffset

  16. textformat api: rangestart

  17. texttrackcue api: starttime

  18. textupdateevent api: selectionstart

  19. textupdateevent api: updaterangestart

  20. xmlhttprequestupload api: `loadstart` event

  21. xmlhttprequest api: `loadstart` event

  22. xrsession api: `selectstart` event

  23. xrsession api: `squeezestart` event

  24. css property: align-content: supported in flex layout: `start` and `end`

  25. css property: align-items: supported in flex layout: `start` and `end`

  26. css property: align-items: supported in grid layout: `start` and `end`

  27. css property: align-self: supported in flex layout: `start` and `end`

  28. css property: justify-content: supported in flex layout: `start` and `end`

  29. css property: position-area: self-x-start

  30. css property: position-area: span-self-x-start

  31. css property: position-area: span-x-start

  32. css property: position-area: x-start

  33. css property: position-try-fallbacks: span-x-self-start

  34. css property: position-try-fallbacks: span-x-start

  35. css property: position-try-fallbacks: x-self-start

  36. css property: position-try-fallbacks: x-start

  37. css property: position-try: span-x-self-start

  38. css property: position-try: span-x-start

  39. css property: position-try: x-self-start

  40. css property: position-try: x-start

  41. css property: text-align-last: start

  42. css property: text-align: start

  43. css property: text-anchor: start

  44. css property: text-box-trim: trim-start

  45. css property: text-box: trim-start

  46. css property: text-spacing-trim: trim-start

  47. svg element: textpath: startoffset