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. document api: hasfocus

  7. document api: hasprivatetoken

  8. document api: hasredemptionrecord

  9. document api: hasstorageaccess

  10. document api: hasunpartitionedcookieaccess

  11. element api: hasattribute

  12. element api: hasattributens

  13. element api: hasattributes

  14. element api: haspointercapture

  15. eventcounts api: has

  16. fontfaceset api: has

  17. formdata api: has

  18. gamepadpose api: hasorientation

  19. gamepadpose api: hasposition

  20. hashchangeevent api

  21. hashchangeevent api: newurl

  22. hashchangeevent api: oldurl

  23. headers api: has

  24. highlight api: has

  25. location api: hash

  26. midiinputmap api: has

  27. midioutputmap api: has

  28. navigateevent api: hashchange

  29. navigateevent api: hasuavisualtransition

  30. node api: haschildnodes

  31. popstateevent api: hasuavisualtransition

  32. pushmanager api: haspermission

  33. rtcstatsreport api: has

  34. sensor api: hasreading

  35. urlpattern api: hash

  36. urlpattern api: hasregexpgroups

  37. url api: hash

  38. xranchorset api: has

  39. javascript built-in: function: [symbol.hasinstance]

  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