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. CSS3 Opacity

    Method of setting the transparency level of an element

  3. csspseudoelement api: parent

  4. cssrule api: parentrule

  5. cssrule api: parentstylesheet

  6. cssstyledeclaration api: parentrule

  7. css api: `supports()` static method: parentheses for single-argument version are optional.

  8. filesystementry api: getparent

  9. htmlelement api: offsetparent

  10. node api: parentelement

  11. node api: parentnode

  12. stylesheet api: parentstylesheet

  13. treewalker api: parentnode

  14. window api: parent

  15. css property: accent-color: transparent

  16. css property: background-color: transparent

  17. css property: background: transparent

  18. css property: border-block: transparent

  19. css property: border-bottom: transparent

  20. css property: border-color: transparent

  21. css property: border-inline: transparent

  22. css property: border-left: transparent

  23. css property: border-right: transparent

  24. css property: border-top: transparent

  25. css property: border: transparent

  26. css property: caret-color: transparent

  27. css property: color: transparent

  28. css property: column-rule: transparent

  29. css property: flood-color: transparent

  30. css property: forced-color-adjust: preserve-parent-color

  31. css property: lighting-color: transparent

  32. css property: outline-color: transparent

  33. css property: outline: transparent

  34. css property: row-rule-color: transparent

  35. css property: row-rule: transparent

  36. css property: rule-color: transparent

  37. css property: rule: transparent

  38. css property: stop-color: transparent

  39. css property: stroke-color: transparent

  40. css property: text-align-last: match-parent

  41. css property: text-align: match-parent

  42. css property: text-decoration: transparent

  43. css property: text-emphasis: transparent

  44. css selector: `:first-child`: matches elements with no parent

  45. css selector: `:last-child`: matches elements with no parent

  46. css selector: `:nth-child()`: matches elements with no parent

  47. css selector: `:nth-last-child()`: matches elements with no parent

  48. css selector: `:only-child`: matches elements with no parent

  49. types: `<color>`: `<named-color>`: transparent

  50. types: `<color>`: transparent