1. :has() CSS relational pseudo-class

    Only select elements containing specified 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. hashchangeevent api

  20. hashchangeevent api: newurl

  21. hashchangeevent api: oldurl

  22. headers api: has

  23. htmlanchorelement api: hash

  24. htmlareaelement api: hash

  25. keyboardlayoutmap api: has

  26. location api: hash

  27. mediakeystatusmap api: has

  28. midiinputmap api: has

  29. midioutputmap api: has

  30. navigationevent api: hashchange

  31. node api: hasattributes

  32. node api: haschildnodes

  33. pushmanager api: haspermission

  34. rtcstatsreport api: has

  35. sensor api: hasreading

  36. urlpattern api: hash

  37. urlsearchparams api: has

  38. url api: hash

  39. vrdisplaycapabilities api: hasexternaldisplay

  40. vrdisplaycapabilities api: hasorientation

  41. vrdisplaycapabilities api: hasposition

  42. workerlocation api: hash

  43. xranchorset api: has

  44. javascript built-in: map: has

  45. javascript built-in: object: hasown

  46. javascript built-in: object: hasownproperty

  47. javascript built-in: regexp: hasindices

  48. javascript built-in: set: has

  49. javascript built-in: symbol: hasinstance

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