1. Case-insensitive CSS attribute selectors

    Including an `i` before the `]` in a CSS attribute selector causes the attribute value to be matched in an ASCII-case-insensitive manner. For example, `[b="xyz" i]` would match both `<a b="xyz">` and `<a b="XYZ">`.

  2. Element.insertAdjacentElement() & Element.insertAdjacentText()

    Methods for inserting an element or text before or after a given element, or appending or prepending an element or text to a given element's list of children.

  3. Element.insertAdjacentHTML()

    Inserts a string of HTML into a specified position in the DOM relative to the given element.

  4. Intrinsic & Extrinsic Sizing

    Allows for the heights and widths to be specified in intrinsic values using the `max-content`, `min-content`, `fit-content` and `stretch` (formerly `fill`) properties.

  5. Upgrade Insecure Requests

    Declare that browsers should transparently upgrade HTTP resources on a website to HTTPS.

  6. characterdata api: insertdata

  7. element api: insertadjacentelement

  8. element api: insertadjacenthtml

  9. element api: insertadjacenttext

  10. installevent api

  11. installevent api: activeworker

  12. node api: insertbefore

  13. range api: insertnode

  14. rtcdtmfsender api: insertdtmf

  15. svgpointlist api: insertitembefore

  16. css property: inset

  17. css property: inset-block

  18. css property: inset-block-end

  19. css property: inset-block-start

  20. css property: inset-inline

  21. css property: inset-inline-end

  22. css property: inset-inline-start

  23. html element: ins

  24. html element: ins: cite

  25. html element: ins: datetime

  26. javascript built-in: temporal api: temporal.instant interface

  27. javascript built-in: temporal api: temporal.instant interface: temporal.instant.add()

  28. javascript built-in: temporal api: temporal.instant interface: temporal.instant.compare()

  29. javascript built-in: temporal api: temporal.instant interface: temporal.instant constructor

  30. javascript built-in: temporal api: temporal.instant interface: temporal.instant.equals()

  31. javascript built-in: temporal api: temporal.instant interface: temporal.instant.from()

  32. javascript built-in: temporal api: temporal.instant interface: temporal.instant.fromepochmicroseconds()

  33. javascript built-in: temporal api: temporal.instant interface: temporal.instant.fromepochmilliseconds()

  34. javascript built-in: temporal api: temporal.instant interface: temporal.instant.fromepochnanoseconds()

  35. javascript built-in: temporal api: temporal.instant interface: temporal.instant.fromepochseconds()

  36. javascript built-in: temporal api: temporal.instant interface: temporal.instant.round()

  37. javascript built-in: temporal api: temporal.instant interface: temporal.instant.since()

  38. javascript built-in: temporal api: temporal.instant interface: temporal.instant.subtract()

  39. javascript built-in: temporal api: temporal.instant interface: temporal.instant.tojson()

  40. javascript built-in: temporal api: temporal.instant interface: temporal.instant.tolocalestring()

  41. javascript built-in: temporal api: temporal.instant interface: temporal.instant.tostring()

  42. javascript built-in: temporal api: temporal.instant interface: temporal.instant.tozoneddatetime()

  43. javascript built-in: temporal api: temporal.instant interface: temporal.instant.tozoneddatetimeiso()

  44. javascript built-in: temporal api: temporal.instant interface: temporal.instant.until()

  45. javascript built-in: temporal api: temporal.instant interface: temporal.instant.valueof()

  46. javascript built-in: temporal api: temporal.now interface: temporal.now.instant()

  47. javascript built-in: webassembly: instance

  48. javascript built-in: webassembly: instance: exports

  49. javascript built-in: webassembly: instantiate

  50. javascript built-in: webassembly: instantiatestreaming