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 font-stretch
If a font has multiple types of variations based on the width of characters, the `font-stretch` property allows the appropriate one to be selected. The property in itself does not cause the browser to stretch to a font.
selector list argument of :not()
Selectors Level 3 only allowed `:not()` pseudo-class to accept a single simple selector, which the element must not match any of. Thus, `:not(a, .b, [c])` or `:not(a.b[c])` did not work. Selectors Level 4 allows `:not()` to accept a list of selectors. Thus, `:not(a):not(.b):not([c])` can instead be written as `:not(a, .b, [c])` and `:not(a.b[c])` works as intended.
CSS Regions
Method of flowing content into multiple elements, allowing magazine-like layouts. While once supported in WebKit-based browsers and Internet Explorer, implementing the feature is no longer being pursued by any browser.
CSS text-wrap: balance
Allows multiple lines of text to have their lines broken in such a way that each line is roughly the same width, often used to make headlines more readable and visually appealing.
Multiple file selection
Allows users to select multiple files in the file picker.
CSS3 Multiple backgrounds
Method of using multiple images as a background
CSS3 Multiple column layout
Method of flowing information in multiple columns
Shared Web Workers
Method of allowing multiple scripts to communicate with a single web worker.
Variable fonts
OpenType font settings that allows a single font file to behave like multiple fonts: it can contain all the allowed variations in width, weight, slant, optical size, or any other exposed axes of variation as defined by the font designer. Variations can be applied via the `font-variation-settings` property.
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.
WebAssembly Multi-Value
An extension to WebAssembly allowing instructions, blocks and functions to produce multiple result values
WebAssembly Reference Types
An extension to WebAssembly allowing opaque references as first-class types, and multiple tables
WebTransport
Protocol framework to send and receive data from servers using [HTTP3](/http3). Similar to [WebSockets](/websockets) but with support for multiple streams, unidirectional streams, out-of-order delivery, and reliable as well as unreliable transport.
CSS3 word-break
Property to prevent or allow words to be broken over multiple lines between letters.
domtokenlist api: add: multiple parameters for `add()`
domtokenlist api: remove: multiple parameters for `remove()`
htmlinputelement api: multiple
htmlselectelement api: multiple
css property: background-attachment: multiple backgrounds
css property: background-image: multiple backgrounds
css property: background-position: multiple backgrounds
css property: background-repeat: multiple backgrounds
css property: background: multiple backgrounds
css property: box-shadow: multiple shadows
css property: mask-image: multiple mask images
css property: overflow: multiple keyword syntax for `overflow-x` and `overflow-y`
html element: input: multiple
html element: select: multiple
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