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. element api: hasattribute

  10. element api: hasattributens

  11. element api: hasattributes

  12. element api: haspointercapture

  13. eventcounts api: has

  14. fontfaceset api: has

  15. formdata api: has

  16. gamepadpose api: hasorientation

  17. gamepadpose api: hasposition

  18. hashchangeevent api

  19. hashchangeevent api: newurl

  20. hashchangeevent api: oldurl

  21. headers api: has

  22. highlight api: has

  23. htmlareaelement api: hash

  24. keyboardlayoutmap api: has

  25. location api: hash

  26. midiinputmap api: has

  27. midioutputmap api: has

  28. navigateevent api: hashchange

  29. node api: hasattributes

  30. node api: haschildnodes

  31. pushmanager api: haspermission

  32. rtcstatsreport api: has

  33. sensor api: hasreading

  34. urlpattern api: hash

  35. urlsearchparams api: has

  36. url api: hash

  37. useractivation api: hasbeenactive

  38. workerlocation api: hash

  39. xranchorset api: has

  40. javascript built-in: map: has

  41. javascript built-in: object: hasown

  42. javascript built-in: object: hasownproperty

  43. javascript built-in: proxy: handler: has

  44. javascript built-in: reflect: has

  45. javascript built-in: regexp: hasindices

  46. javascript built-in: set: has

  47. javascript built-in: symbol: hasinstance

  48. javascript built-in: weakmap: has

  49. javascript built-in: weakset: has

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