1. :has() CSS relational pseudo-class

    Select elements containing specific content. For example, `a:has(img)` selects all `<a>` elements that contain an `<img>` child.

  2. Hashchange event

    Event triggered in JavaScript when the URL's hash has changed (for example: page.html#foo to page.html#bar)

  3. 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.

  4. audioparammap api: has

  5. cachestorage api: has

  6. customstateset api: has

  7. document api: hasfocus

  8. document api: hasstorageaccess

  9. domimplementation api: hasfeature

  10. element api: hasattribute

  11. element api: hasattributens

  12. element api: hasattributes

  13. element api: haspointercapture

  14. eventcounts api: has

  15. fontfaceset api: has

  16. formdata api: has

  17. gamepadpose api: hasorientation

  18. gamepadpose api: hasposition

  19. gpusupportedfeatures api: has

  20. hashchangeevent api

  21. hashchangeevent api: newurl

  22. hashchangeevent api: oldurl

  23. headers api: has

  24. highlightregistry api: has

  25. highlight api: has

  26. htmlanchorelement api: hash

  27. htmlareaelement api: hash

  28. keyboardlayoutmap api: has

  29. location api: hash

  30. mediakeystatusmap api: has

  31. midiinputmap api: has

  32. midioutputmap api: has

  33. navigateevent api: hashchange

  34. node api: haschildnodes

  35. pushmanager api: haspermission

  36. rtcstatsreport api: has

  37. sensor api: hasreading

  38. urlpattern api: hash

  39. urlsearchparams api: has

  40. urlsearchparams api: has: `value` parameter

  41. url api: hash

  42. useractivation api: hasbeenactive

  43. vrdisplaycapabilities api: hasorientation

  44. vrdisplaycapabilities api: hasposition

  45. wgsllanguagefeatures api: has

  46. workerlocation api: hash

  47. xranchorset api: has

  48. javascript built-in: map: has

  49. javascript built-in: set: has

  50. grammar: hashbang (`#!`) comment syntax