Audio Tracks
Method of specifying and selecting between multiple audio tracks. Useful for providing audio descriptions, director's commentary, additional languages, alternative takes, etc.
CSS text-box-trim & text-box-edge
Provides the ability to remove the vertical space appearing above and below text glyphs, allowing more precise positioning and alignment. Previously specified as the `leading-trim` & `text-edge` properties.
CSS3 Transitions
Simple method of animating certain properties of an element, with ability to define property, duration, delay and timing function.
Do Not Track API
API to allow the browser's Do Not Track setting to be queried via `navigator.doNotTrack`. Due to lack of adoption the Do Not Track specification was deprecated in 2018.
PageTransitionEvent
Fired at the Window when the page's entry in the session history stops being the current entry. Includes the `pageshow` and `pagehide` events.
PNG alpha transparency
Semi-transparent areas in PNG files
CSS3 2D Transforms
Method of transforming an element including rotating, scaling, etc. Includes support for `transform` as well as `transform-origin` properties.
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.
Trusted Types for DOM manipulation
An API that forces developers to be very explicit about their use of powerful DOM-injection APIs. Can greatly improve security against XSS attacks.
TTF/OTF - TrueType and OpenType font support
Support for the TrueType (.ttf) and OpenType (.otf) outline font formats in @font-face.
Video Tracks
Method of specifying and selecting between multiple video tracks. Useful for providing sign language tracks, burnt-in captions or subtitles, alternative camera angles, etc.
View Transitions API (single-document)
Provides a mechanism for easily creating animated transitions between different DOM states, while also updating the DOM contents in a single step. This API is specific to single-document transitions, support for same-origin cross-document transitions is [being planned](https://github.com/WICG/view-transitions/blob/main/cross-doc-explainer.md).
WebVTT - Web Video Text Tracks
Format for marking up text captions for multimedia resources.
trackevent api
trackevent api: track
transitionevent api
transitionevent api: elapsedtime
transitionevent api: propertyname
transitionevent api: pseudoelement
treewalker api
treewalker api: currentnode
treewalker api: filter
treewalker api: firstchild
treewalker api: lastchild
treewalker api: nextnode
treewalker api: nextsibling
treewalker api: parentnode
treewalker api: previousnode
treewalker api: previoussibling
treewalker api: root
treewalker api: whattoshow
trustedhtml api
trustedhtml api: tojson
trustedscript api
trustedscripturl api
trustedscripturl api: tojson
trustedscript api: tojson
trustedtypepolicy api
trustedtypepolicyfactory api
trustedtypepolicyfactory api: emptyhtml
trustedtypepolicyfactory api: emptyscript
trustedtypepolicyfactory api: ishtml
trustedtypepolicyfactory api: isscript
trustedtypepolicyfactory api: isscripturl
trustedtypepolicy api: createhtml
trustedtypepolicy api: createscript
trustedtypepolicy api: createscripturl
trustedtypepolicy api: name
trustedtypes api
html element: tr
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