1. CSS zoom

    Non-standard method of scaling content.

  2. Form validation

    Method of setting required fields and field types without requiring JavaScript. This includes preventing forms from being submitted when appropriate, the `checkValidity()` method as well as support for the `:invalid`, `:valid`, and `:required` CSS pseudo-classes.

  3. Resource Hints: prefetch

    Informs the browsers that a given resource should be prefetched so it can be loaded more quickly. This is indicated using `<link rel="prefetch" href="(url)">`

  4. SVG effects for HTML

    Method of using SVG transforms, filters, etc on HTML elements using either CSS or the foreignObject element

  5. CSS3 2D Transforms

    Method of transforming an element including rotating, scaling, etc. Includes support for `transform` as well as `transform-origin` properties.

  6. CSS3 3D Transforms

    Method of transforming an element in the third dimension using the `transform` property. Includes support for the `perspective` property to set the perspective in z-space and the `backface-visibility` property to toggle display of the reverse side of a 3D-transformed element.

  7. beforeinstallpromptevent api: platforms

  8. document api: forms

  9. transformstream api

  10. transformstreamdefaultcontroller api

  11. transformstreamdefaultcontroller api: desiredsize

  12. transformstreamdefaultcontroller api: enqueue

  13. transformstreamdefaultcontroller api: error

  14. transformstreamdefaultcontroller api: terminate

  15. transformstream api: readable

  16. transformstream api: transferable

  17. transformstream api: `transformstream()` constructor

  18. transformstream api: writable

  19. webgl2renderingcontext api: getactiveuniforms

  20. css at-rule: `@font-feature-values`: `@historical-forms`

  21. css property: font-variant-alternates: historical-forms

  22. css property: font-variant: historical-forms

  23. html element: iframe: sandbox: `sandbox="allow-forms"`