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. cssgroupingrule api: insertrule

  8. cssstylerule api: insertrule

  9. element api: insertadjacentelement

  10. element api: insertadjacenthtml

  11. element api: insertadjacenttext

  12. gpucommandencoder api: insertdebugmarker

  13. gpucomputepassencoder api: insertdebugmarker

  14. gpurenderbundleencoder api: insertdebugmarker

  15. gpurenderpassencoder api: insertdebugmarker

  16. htmltableelement api: insertrow

  17. htmltablerowelement api: insertcell

  18. htmltablerowelement api: insertcell: `index` parameter can be `-1`

  19. htmltablerowelement api: insertcell: `index` parameter is optional

  20. installevent api

  21. mlgraphbuilder api: instancenormalization

  22. node api: insertbefore

  23. paymentmanager api: instruments

  24. paymentrequestevent api: instrumentkey

  25. range api: insertnode

  26. rtcdtmfsender api: insertdtmf

  27. svglengthlist api: insertitembefore

  28. svgnumberlist api: insertitembefore

  29. svgpointlist api: insertitembefore

  30. svgstringlist api: insertitembefore

  31. svgtransformlist api: insertitembefore

  32. css property: border-style: inset

  33. css property: inset

  34. css property: inset-block

  35. css property: inset-block-end

  36. css property: inset-block-end: auto

  37. css property: inset-block-start

  38. css property: inset-block-start: auto

  39. css property: inset-block: auto

  40. css property: inset-inline

  41. css property: inset-inline-end

  42. css property: inset-inline-end: auto

  43. css property: inset-inline-start

  44. css property: inset-inline-start: auto

  45. css property: inset-inline: auto

  46. css property: inset: auto

  47. html element: ins

  48. html element: ins: cite

  49. html element: ins: datetime

  50. javascript operator: instanceof