1. Details & Summary elements

    The <details> element generates a simple no-JavaScript widget to show/hide element contents, optionally by clicking on its child <summary> element.

  2. Document.execCommand()

    Allows running commands to manipulate the contents of an editable region in a document switched to designMode

  3. DOMMatrix

    The `DOMMatrix` interface represents 4x4 matrices, suitable for 2D and 3D operations. Supersedes the `WebKitCSSMatrix` and `SVGMatrix` interfaces.

  4. Efficient Script Yielding: setImmediate()

    Yields control flow without the minimum delays enforced by setTimeout

  5. commandevent api

  6. commandevent api: source

  7. comment api

  8. css api: `mm()` static method

  9. dommatrix api

  10. dommatrixreadonly api

  11. dommatrixreadonly api: a

  12. dommatrixreadonly api: b

  13. dommatrixreadonly api: c

  14. dommatrixreadonly api: d

  15. dommatrixreadonly api: e

  16. dommatrixreadonly api: f

  17. dommatrix api: a

  18. dommatrix api: b

  19. dommatrix api: c

  20. dommatrix api: d

  21. dommatrix api: e

  22. dommatrix api: f

  23. dommatrix api: m11

  24. dommatrix api: m12

  25. dommatrix api: m13

  26. dommatrix api: m14

  27. dommatrix api: m21

  28. dommatrix api: m22

  29. dommatrix api: m23

  30. dommatrix api: m24

  31. dommatrix api: m31

  32. dommatrix api: m32

  33. dommatrix api: m33

  34. dommatrix api: m34

  35. dommatrix api: m41

  36. dommatrix api: m42

  37. dommatrix api: m43

  38. dommatrix api: m44

  39. summarizer api

  40. html element: summary

  41. javascript built-in: set: symmetricdifference

  42. javascript operator: comma operator

  43. elements: mmultiscripts

  44. elements: mmultiscripts: subscriptshift

  45. elements: mmultiscripts: superscriptshift