1. CSS ::marker pseudo-element

    The `::marker` pseudo-element allows list item markers to be styled or have their content value customized.

  2. CSS font-variant-numeric

    CSS property that provides different ways of displaying numbers, fractions, and ordinal markers.

  3. HTML5 semantic elements

    HTML5 offers some new elements, primarily for semantic purposes. The elements include: `section`, `article`, `aside`, `header`, `footer`, `nav`, `figure`, `figcaption`, `time`, `mark` & `main`.

  4. HTML templates

    Method of declaring a portion of reusable markup that is parsed but not rendered until cloned.

  5. text-emphasis styling

    Method of using small symbols next to each glyph to emphasize a run of text, commonly used in East Asian languages. The `text-emphasis` shorthand, and its `text-emphasis-style` and `text-emphasis-color` longhands, can be used to apply marks to the text. The `text-emphasis-position` property, which inherits separately, allows setting the emphasis marks' position with respect to the text.

  6. User Timing API

    Method to help web developers measure the performance of their applications by giving them access to high precision timestamps.

  7. WebVTT - Web Video Text Tracks

    Format for marking up text captions for multimedia resources.

  8. bytelengthqueuingstrategy api: highwatermark

  9. countqueuingstrategy api: highwatermark

  10. gpucommandencoder api: insertdebugmarker

  11. gpucomputepassencoder api: insertdebugmarker

  12. gpurenderbundleencoder api: insertdebugmarker

  13. gpurenderpassencoder api: insertdebugmarker

  14. performancemark api

  15. performancemark api: detail

  16. performancemark api: `performancemark()` constructor

  17. performance api: clearmarks

  18. performance api: mark

  19. performance api: mark: `markoptions` parameter

  20. performance api: mark: returns `performancemark`

  21. speechsynthesisutterance api: `mark` event

  22. svgmarkerelement api

  23. svgmarkerelement api: markerheight

  24. svgmarkerelement api: markerunits

  25. svgmarkerelement api: markerwidth

  26. svgmarkerelement api: orient

  27. svgmarkerelement api: orientangle

  28. svgmarkerelement api: orienttype

  29. svgmarkerelement api: preserveaspectratio

  30. svgmarkerelement api: refx

  31. svgmarkerelement api: refy

  32. svgmarkerelement api: setorienttoangle

  33. svgmarkerelement api: setorienttoauto

  34. svgmarkerelement api: viewbox

  35. webtransportdatagramduplexstream api: incominghighwatermark

  36. webtransportdatagramduplexstream api: outgoinghighwatermark

  37. css selector: `::-webkit-details-marker`

  38. css selector: `::marker`: animation and transition support

  39. types: <color>: system colors: mark, marktext, buttonborder

  40. html element: input: `type="range"`: tick mark support

  41. html element: mark

  42. svg element: marker

  43. svg element: marker: markerheight

  44. svg element: marker: markerunits

  45. svg element: marker: markerwidth

  46. svg element: marker: orient

  47. svg element: marker: refx

  48. svg element: marker: refy

  49. svg element: marker: viewbox