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---
title: "Terms starting with letter u"
layout: base
---
<p class=legend>Color key: <code class=webidl>WebIDL</code> <code class='css'>CSS</code> <code class='markup'>Markup</code> <code class='http'>HTTP</code></p>
<dl>
<dt id="u@@html%%element"><code class=prefix></code><span><strong><code class=markup>u</code></strong> (<em>markup element</em>) <a class='self-link' href='#u%40%40html%25%25element' aria-label="Permalink for u">§</a></span></dt>
<dd>Defined in <strong title='u is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-u-element>HTML</a></strong> </dd>
<dd>Referenced in
<a href=https://w3c.github.io/editing/docs/execCommand/ title='u is referenced by execCommand'>execCommand</a>,
<a href=https://w3c.github.io/html-aam/ title='u is referenced by HTML Accessibility API Mappings 1.0'>HTML Accessibility API Mappings 1.0</a>,
<a href=https://w3c.github.io/html-aria/ title='u is referenced by ARIA in HTML'>ARIA in HTML</a>,
<a href=https://w3c.github.io/webvtt/ title='u is referenced by WebVTT: The Web Video Text Tracks Format'>WebVTT: The Web Video Text Tracks Format</a></dd>
<dt id="u8@@AudioSampleFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"u8"</code></strong> (<em>value for <a href='a.html#AudioSampleFormat@@@@enum'><code>AudioSampleFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#u8%40%40AudioSampleFormat%40enum-value' aria-label="Permalink for u8">§</a></span></dt>
<dd>Defined in <strong title='u8 is defined in WebCodecs'><a href=https://w3c.github.io/webcodecs/#dom-audiosampleformat-u8>WebCodecs</a></strong> </dd>
<dd>Referenced in
<a href=https://w3c.github.io/webcodecs/pcm_codec_registration.html title='u8 is referenced by Linear PCM WebCodecs Registration'>Linear PCM WebCodecs Registration</a></dd>
<dt id="u8-planar@@AudioSampleFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"u8-planar"</code></strong> (<em>value for <a href='a.html#AudioSampleFormat@@@@enum'><code>AudioSampleFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#u8-planar%40%40AudioSampleFormat%40enum-value' aria-label="Permalink for u8-planar">§</a></span></dt>
<dd>Defined in <strong title='u8-planar is defined in WebCodecs'><a href=https://w3c.github.io/webcodecs/#dom-audiosampleformat-u8-planar>WebCodecs</a></strong> </dd>
<dt id="UADataValues@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UADataValues</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UADataValues%40%40%40%40dictionary' aria-label="Permalink for UADataValues">§</a></span></dt>
<dd>Defined in <strong title='UADataValues is defined in User-Agent Client Hints'><a href=https://wicg.github.io/ua-client-hints/#dictdef-uadatavalues>User-Agent Client Hints</a></strong> </dd>
<dd>Related terms: <code>UADataValues.</code><a href='a.html#architecture@@UADataValues@dict-member'><code>architecture</code></a>, <code>UADataValues.</code><a href='b.html#bitness@@UADataValues@dict-member'><code>bitness</code></a>, <code>UADataValues.</code><a href='b.html#brands@@UADataValues@dict-member'><code>brands</code></a>, <code>UADataValues.</code><a href='f.html#formFactors@@UADataValues@dict-member'><code>formFactors</code></a>, <code>UADataValues.</code><a href='f.html#fullVersionList@@UADataValues@dict-member'><code>fullVersionList</code></a>, <code>UADataValues.</code><a href='m.html#mobile@@UADataValues@dict-member'><code>mobile</code></a>, <code>UADataValues.</code><a href='m.html#model@@UADataValues@dict-member'><code>model</code></a>, <code>UADataValues.</code><a href='p.html#platform@@UADataValues@dict-member'><code>platform</code></a>, <code>UADataValues.</code><a href='p.html#platformVersion@@UADataValues@dict-member'><code>platformVersion</code></a>, <code>UADataValues.</code><a href='u.html#uaFullVersion@@UADataValues@dict-member'><code>uaFullVersion</code></a>, <code>UADataValues.</code><a href='w.html#wow64@@UADataValues@dict-member'><code>wow64</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UADataValues.html' title='UADataValues entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="uaFullVersion@@UADataValues@dict-member"><code class=prefix><a href='u.html#UADataValues@@@@dictionary'>UADataValues</a>.</code><span><strong><code class=webidl>uaFullVersion</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#uaFullVersion%40%40UADataValues%40dict-member' aria-label="Permalink for <a href='u.html#UADataValues@@@@dictionary'>UADataValues</a>.uaFullVersion">§</a></span></dt>
<dd>Defined in <strong title='uaFullVersion is defined in User-Agent Client Hints'><a href=https://wicg.github.io/ua-client-hints/#dom-uadatavalues-uafullversion>User-Agent Client Hints</a></strong> </dd>
<dt id="UALowEntropyJSON@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UALowEntropyJSON</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UALowEntropyJSON%40%40%40%40dictionary' aria-label="Permalink for UALowEntropyJSON">§</a></span></dt>
<dd>Defined in <strong title='UALowEntropyJSON is defined in User-Agent Client Hints'><a href=https://wicg.github.io/ua-client-hints/#dictdef-ualowentropyjson>User-Agent Client Hints</a></strong> </dd>
<dd>Related terms: <code>UALowEntropyJSON.</code><a href='b.html#brands@@UALowEntropyJSON@dict-member'><code>brands</code></a>, <code>UALowEntropyJSON.</code><a href='m.html#mobile@@UALowEntropyJSON@dict-member'><code>mobile</code></a>, <code>UALowEntropyJSON.</code><a href='p.html#platform@@UALowEntropyJSON@dict-member'><code>platform</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UALowEntropyJSON.html' title='UALowEntropyJSON entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="udp@@RTCIceProtocol@enum-value"><code class=prefix></code><span><strong><code class=webidl>"udp"</code></strong> (<em>value for <a href='r.html#RTCIceProtocol@@@@enum'><code>RTCIceProtocol</code></a> WebIDL enumeration</em>) <a class='self-link' href='#udp%40%40RTCIceProtocol%40enum-value' aria-label="Permalink for udp">§</a></span></dt>
<dd>Defined in <strong title='udp is defined in WebRTC 1.0'><a href=https://w3c.github.io/webrtc-pc/#dom-rtciceprotocol-udp>WebRTC 1.0</a></strong> </dd>
<dt id="udp@@RTCIceServerTransportProtocol@enum-value"><code class=prefix></code><span><strong><code class=webidl>"udp"</code></strong> (<em>value for <a href='r.html#RTCIceServerTransportProtocol@@@@enum'><code>RTCIceServerTransportProtocol</code></a> WebIDL enumeration</em>) <a class='self-link' href='#udp%40%40RTCIceServerTransportProtocol%40enum-value' aria-label="Permalink for udp">§</a></span></dt>
<dd>Defined in <strong title='udp is defined in WebRTC 1.0'><a href=https://w3c.github.io/webrtc-pc/#dom-rtciceservertransportprotocol-udp>WebRTC 1.0</a></strong> </dd>
<dt id="UDPMessage@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UDPMessage</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UDPMessage%40%40%40%40dictionary' aria-label="Permalink for UDPMessage">§</a></span></dt>
<dd>Defined in <strong title='UDPMessage is defined in Direct Sockets API'><a href=https://wicg.github.io/direct-sockets/#dom-udpmessage>Direct Sockets API</a></strong> </dd>
<dd>Related terms: <code>UDPMessage.</code><a href='d.html#data@@UDPMessage@dict-member'><code>data</code></a>, <code>UDPMessage.</code><a href='d.html#dnsQueryType@@UDPMessage@dict-member'><code>dnsQueryType</code></a>, <code>UDPMessage.</code><a href='r.html#remoteAddress@@UDPMessage@dict-member'><code>remoteAddress</code></a>, <code>UDPMessage.</code><a href='r.html#remotePort@@UDPMessage@dict-member'><code>remotePort</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UDPMessage.html' title='UDPMessage entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UDPSocket@@@@interface"><code class=prefix></code><span><strong><code class=webidl>UDPSocket</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#UDPSocket%40%40%40%40interface' aria-label="Permalink for UDPSocket">§</a></span></dt>
<dd>Defined in <strong title='UDPSocket is defined in Direct Sockets API'><a href=https://wicg.github.io/direct-sockets/#dom-udpsocket>Direct Sockets API</a></strong> </dd>
<dd>Related terms: <code>UDPSocket.</code><a href='c.html#closed@@UDPSocket@attribute'><code>closed</code></a>, <code>UDPSocket.</code><a href='o.html#opened@@UDPSocket@attribute'><code>opened</code></a>, <em>WebIDL constructor</em> <a href='c.html#constructor()@@UDPSocket@constructor'><code>constructor()</code></a>, <code>UDPSocket.</code><a href='c.html#close()@@UDPSocket@method'><code>close()</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UDPSocket.html' title='UDPSocket entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UDPSocketOpenInfo@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UDPSocketOpenInfo</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UDPSocketOpenInfo%40%40%40%40dictionary' aria-label="Permalink for UDPSocketOpenInfo">§</a></span></dt>
<dd>Defined in <strong title='UDPSocketOpenInfo is defined in Direct Sockets API'><a href=https://wicg.github.io/direct-sockets/#dom-udpsocketopeninfo>Direct Sockets API</a></strong> </dd>
<dd>Related terms: <code>UDPSocketOpenInfo.</code><a href='l.html#localAddress@@UDPSocketOpenInfo@dict-member'><code>localAddress</code></a>, <code>UDPSocketOpenInfo.</code><a href='l.html#localPort@@UDPSocketOpenInfo@dict-member'><code>localPort</code></a>, <code>UDPSocketOpenInfo.</code><a href='m.html#multicastController@@UDPSocketOpenInfo@dict-member'><code>multicastController</code></a>, <code>UDPSocketOpenInfo.</code><a href='r.html#readable@@UDPSocketOpenInfo@dict-member'><code>readable</code></a>, <code>UDPSocketOpenInfo.</code><a href='r.html#remoteAddress@@UDPSocketOpenInfo@dict-member'><code>remoteAddress</code></a>, <code>UDPSocketOpenInfo.</code><a href='r.html#remotePort@@UDPSocketOpenInfo@dict-member'><code>remotePort</code></a>, <code>UDPSocketOpenInfo.</code><a href='w.html#writable@@UDPSocketOpenInfo@dict-member'><code>writable</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UDPSocketOpenInfo.html' title='UDPSocketOpenInfo entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UDPSocketOptions@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UDPSocketOptions</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UDPSocketOptions%40%40%40%40dictionary' aria-label="Permalink for UDPSocketOptions">§</a></span></dt>
<dd>Defined in <strong title='UDPSocketOptions is defined in Direct Sockets API'><a href=https://wicg.github.io/direct-sockets/#dom-udpsocketoptions>Direct Sockets API</a></strong> </dd>
<dd>Related terms: <code>UDPSocketOptions.</code><a href='d.html#dnsQueryType@@UDPSocketOptions@dict-member'><code>dnsQueryType</code></a>, <code>UDPSocketOptions.</code><a href='i.html#ipv6Only@@UDPSocketOptions@dict-member'><code>ipv6Only</code></a>, <code>UDPSocketOptions.</code><a href='l.html#localAddress@@UDPSocketOptions@dict-member'><code>localAddress</code></a>, <code>UDPSocketOptions.</code><a href='l.html#localPort@@UDPSocketOptions@dict-member'><code>localPort</code></a>, <code>UDPSocketOptions.</code><a href='m.html#multicastAllowAddressSharing@@UDPSocketOptions@dict-member'><code>multicastAllowAddressSharing</code></a>, <code>UDPSocketOptions.</code><a href='m.html#multicastLoopback@@UDPSocketOptions@dict-member'><code>multicastLoopback</code></a>, <code>UDPSocketOptions.</code><a href='m.html#multicastTimeToLive@@UDPSocketOptions@dict-member'><code>multicastTimeToLive</code></a>, <code>UDPSocketOptions.</code><a href='r.html#receiveBufferSize@@UDPSocketOptions@dict-member'><code>receiveBufferSize</code></a>, <code>UDPSocketOptions.</code><a href='r.html#remoteAddress@@UDPSocketOptions@dict-member'><code>remoteAddress</code></a>, <code>UDPSocketOptions.</code><a href='r.html#remotePort@@UDPSocketOptions@dict-member'><code>remotePort</code></a>, <code>UDPSocketOptions.</code><a href='s.html#sendBufferSize@@UDPSocketOptions@dict-member'><code>sendBufferSize</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UDPSocketOptions.html' title='UDPSocketOptions entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="ui-monospace@@<generic-family>@value"><code class=prefix></code><span><strong><code class=css>ui-monospace</code></strong> (<em>CSS value for <a href='g.html#<generic-family>@@@@type'><code><generic-family></code></a>, <a href='f.html#font-family@@@@property'><code>font-family</code></a> property </em>) <a class='self-link' href='#ui-monospace%40%40%3Cgeneric-family%3E%40value' aria-label="Permalink for ui-monospace">§</a></span></dt>
<dd>Defined in <strong title='ui-monospace is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-family-ui-monospace>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ui-monospace is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ui-monospace is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ui-monospace is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="ui-rounded@@<generic-family>@value"><code class=prefix></code><span><strong><code class=css>ui-rounded</code></strong> (<em>CSS value for <a href='g.html#<generic-family>@@@@type'><code><generic-family></code></a>, <a href='f.html#font-family@@@@property'><code>font-family</code></a> property </em>) <a class='self-link' href='#ui-rounded%40%40%3Cgeneric-family%3E%40value' aria-label="Permalink for ui-rounded">§</a></span></dt>
<dd>Defined in <strong title='ui-rounded is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-family-ui-rounded>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ui-rounded is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ui-rounded is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ui-rounded is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="ui-sans-serif@@<generic-family>@value"><code class=prefix></code><span><strong><code class=css>ui-sans-serif</code></strong> (<em>CSS value for <a href='g.html#<generic-family>@@@@type'><code><generic-family></code></a>, <a href='f.html#font-family@@@@property'><code>font-family</code></a> property </em>) <a class='self-link' href='#ui-sans-serif%40%40%3Cgeneric-family%3E%40value' aria-label="Permalink for ui-sans-serif">§</a></span></dt>
<dd>Defined in <strong title='ui-sans-serif is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-family-ui-sans-serif>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ui-sans-serif is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ui-sans-serif is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ui-sans-serif is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="ui-serif@@<generic-family>@value"><code class=prefix></code><span><strong><code class=css>ui-serif</code></strong> (<em>CSS value for <a href='g.html#<generic-family>@@@@type'><code><generic-family></code></a>, <a href='f.html#font-family@@@@property'><code>font-family</code></a> property </em>) <a class='self-link' href='#ui-serif%40%40%3Cgeneric-family%3E%40value' aria-label="Permalink for ui-serif">§</a></span></dt>
<dd>Defined in <strong title='ui-serif is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-family-ui-serif>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ui-serif is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ui-serif is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ui-serif is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="UIEvent@@@@interface"><code class=prefix></code><span><strong><code class=webidl>UIEvent</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#UIEvent%40%40%40%40interface' aria-label="Permalink for UIEvent">§</a></span></dt>
<dd>Defined in <strong title='UIEvent is defined in UI Events'><a href=https://w3c.github.io/uievents/#uievent>UI Events</a></strong> </dd>
<dd>Referenced in
<a href=https://dom.spec.whatwg.org/ title='UIEvent is referenced by DOM'>DOM</a>,
<a href=https://html.spec.whatwg.org/multipage/ title='UIEvent is referenced by HTML'>HTML</a>,
<a href=https://w3c.github.io/long-animation-frames/ title='UIEvent is referenced by Long Animation Frames API'>Long Animation Frames API</a>,
<a href=https://drafts.csswg.org/css-nav-1/ title='UIEvent is referenced by CSS Spatial Navigation 1'>CSS Spatial Navigation 1</a>,
<a href=https://w3c.github.io/event-timing/ title='UIEvent is referenced by Event Timing API'>Event Timing API</a></dd>
<dd>Related terms: <code>UIEvent.</code><a href='d.html#detail@@UIEvent@attribute'><code>detail</code></a>, <code>UIEvent.</code><a href='s.html#sourceCapabilities@@UIEvent@attribute'><code>sourceCapabilities</code></a>, <code>UIEvent.</code><a href='v.html#view@@UIEvent@attribute'><code>view</code></a>, <code>UIEvent.</code><a href='w.html#which@@UIEvent@attribute'><code>which</code></a>, <code>new </code><a href='u.html#UIEvent(type, eventInitDict)@@UIEvent@constructor'><code>UIEvent(type, eventInitDict)</code></a>, <code>UIEvent.</code><a href='i.html#initUIEvent(typeArg, bubblesArg, cancelableArg, viewArg, detailArg)@@UIEvent@method'><code>initUIEvent(typeArg, bubblesArg, cancelableArg, viewArg, detailArg)</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UIEvent.html' title='UIEvent entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UIEvent(type, eventInitDict)@@UIEvent@constructor"><code class=prefix>new </code><span><strong><code class=webidl>UIEvent(type, eventInitDict)</code></strong> (<em>WebIDL constructor</em>) <a class='self-link' href='#UIEvent(type%2C%20eventInitDict)%40%40UIEvent%40constructor' aria-label="Permalink for new UIEvent(type, eventInitDict)">§</a></span></dt>
<dd>Defined in <strong title='UIEvent(type, eventInitDict) is defined in UI Events'><a href=https://w3c.github.io/uievents/#dom-uievent-uievent>UI Events</a></strong> </dd>
<dt id="UIEventInit@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UIEventInit</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UIEventInit%40%40%40%40dictionary' aria-label="Permalink for UIEventInit">§</a></span></dt>
<dd>Defined in <strong title='UIEventInit is defined in UI Events'><a href=https://w3c.github.io/uievents/#dictdef-uieventinit>UI Events</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-nav-1/ title='UIEventInit is referenced by CSS Spatial Navigation 1'>CSS Spatial Navigation 1</a></dd>
<dd>Related terms: <code>UIEventInit.</code><a href='d.html#detail@@UIEventInit@dict-member'><code>detail</code></a>, <code>UIEventInit.</code><a href='s.html#sourceCapabilities@@UIEventInit@dict-member'><code>sourceCapabilities</code></a>, <code>UIEventInit.</code><a href='v.html#view@@UIEventInit@dict-member'><code>view</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UIEventInit.html' title='UIEventInit entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="uiMode@@CredentialRequestOptions@dict-member"><code class=prefix><a href='c.html#CredentialRequestOptions@@@@dictionary'>CredentialRequestOptions</a>.</code><span><strong><code class=webidl>uiMode</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#uiMode%40%40CredentialRequestOptions%40dict-member' aria-label="Permalink for <a href='c.html#CredentialRequestOptions@@@@dictionary'>CredentialRequestOptions</a>.uiMode">§</a></span></dt>
<dd>Defined in <strong title='uiMode is defined in Credential Management 1'><a href=https://w3c.github.io/webappsec-credential-management/#dom-credentialrequestoptions-uimode>Credential Management 1</a></strong> </dd>
<dt id="uint@@GPUTextureSampleType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint"</code></strong> (<em>value for <a href='g.html#GPUTextureSampleType@@@@enum'><code>GPUTextureSampleType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint%40%40GPUTextureSampleType%40enum-value' aria-label="Permalink for uint">§</a></span></dt>
<dd>Defined in <strong title='uint is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gputexturesampletype-uint>WebGPU</a></strong> </dd>
<dd>Referenced in
<a href=https://gpuweb.github.io/gpuweb/wgsl/ title='uint is referenced by WebGPU Shading Language'>WebGPU Shading Language</a></dd>
<dt id="uint16@@GPUIndexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint16"</code></strong> (<em>value for <a href='g.html#GPUIndexFormat@@@@enum'><code>GPUIndexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint16%40%40GPUIndexFormat%40enum-value' aria-label="Permalink for uint16">§</a></span></dt>
<dd>Defined in <strong title='uint16 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuindexformat-uint16>WebGPU</a></strong> </dd>
<dt id="uint16@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint16"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint16%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint16">§</a></span></dt>
<dd>Defined in <strong title='uint16 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint16>WebGPU</a></strong> </dd>
<dt id="Uint16Array@@@@interface"><code class=prefix></code><span><strong><code class=webidl>Uint16Array</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#Uint16Array%40%40%40%40interface' aria-label="Permalink for Uint16Array">§</a></span></dt>
<dd>Defined in <strong title='Uint16Array is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#idl-Uint16Array>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://w3c.github.io/webcrypto/ title='Uint16Array is referenced by Web Cryptography 2'>Web Cryptography 2</a>,
<a href=https://webmachinelearning.github.io/webnn/ title='Uint16Array is referenced by Web Neural Network API'>Web Neural Network API</a>,
<a href=https://immersive-web.github.io/depth-sensing/ title='Uint16Array is referenced by WebXR Depth Sensing'>WebXR Depth Sensing</a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/Uint16Array.html' title='Uint16Array entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="%Uint16Array%@@@@interface"><code class=prefix></code><span><strong><code class=webidl>%Uint16Array%</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#%25Uint16Array%25%40%40%40%40interface' aria-label="Permalink for %Uint16Array%">§</a></span></dt>
<dd>Defined in <strong title='%Uint16Array% is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-objects>ECMAScript</a></strong> </dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/%Uint16Array%.html' title='%Uint16Array% entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="uint16x2@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint16x2"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint16x2%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint16x2">§</a></span></dt>
<dd>Defined in <strong title='uint16x2 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint16x2>WebGPU</a></strong> </dd>
<dt id="uint16x4@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint16x4"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint16x4%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint16x4">§</a></span></dt>
<dd>Defined in <strong title='uint16x4 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint16x4>WebGPU</a></strong> </dd>
<dt id="uint32@@GPUIndexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32"</code></strong> (<em>value for <a href='g.html#GPUIndexFormat@@@@enum'><code>GPUIndexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32%40%40GPUIndexFormat%40enum-value' aria-label="Permalink for uint32">§</a></span></dt>
<dd>Defined in <strong title='uint32 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuindexformat-uint32>WebGPU</a></strong> </dd>
<dt id="uint32@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint32">§</a></span></dt>
<dd>Defined in <strong title='uint32 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint32>WebGPU</a></strong> </dd>
<dt id="uint32@@MLOperandDataType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32"</code></strong> (<em>value for <a href='m.html#MLOperandDataType@@@@enum'><code>MLOperandDataType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32%40%40MLOperandDataType%40enum-value' aria-label="Permalink for uint32">§</a></span></dt>
<dd>Defined in <strong title='uint32 is defined in Web Neural Network API'><a href=https://webmachinelearning.github.io/webnn/#dom-mloperanddatatype-uint32>Web Neural Network API</a></strong> </dd>
<dt id="Uint32Array@@@@interface"><code class=prefix></code><span><strong><code class=webidl>Uint32Array</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#Uint32Array%40%40%40%40interface' aria-label="Permalink for Uint32Array">§</a></span></dt>
<dd>Defined in <strong title='Uint32Array is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#idl-Uint32Array>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://encoding.spec.whatwg.org/ title='Uint32Array is referenced by Encoding'>Encoding</a>,
<a href=https://immersive-web.github.io/real-world-meshing/ title='Uint32Array is referenced by WebXR Mesh Detection'>WebXR Mesh Detection</a>,
<a href=https://w3c.github.io/webcrypto/ title='Uint32Array is referenced by Web Cryptography 2'>Web Cryptography 2</a>,
<a href=https://gpuweb.github.io/gpuweb/ title='Uint32Array is referenced by WebGPU'>WebGPU</a>,
<a href=https://webmachinelearning.github.io/webnn/ title='Uint32Array is referenced by Web Neural Network API'>Web Neural Network API</a>,
<a href=https://immersive-web.github.io/webxr/ title='Uint32Array is referenced by WebXR Device API'>WebXR Device API</a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/Uint32Array.html' title='Uint32Array entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="%Uint32Array%@@@@interface"><code class=prefix></code><span><strong><code class=webidl>%Uint32Array%</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#%25Uint32Array%25%40%40%40%40interface' aria-label="Permalink for %Uint32Array%">§</a></span></dt>
<dd>Defined in <strong title='%Uint32Array% is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-objects>ECMAScript</a></strong> </dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/%Uint32Array%.html' title='%Uint32Array% entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="uint32x2@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32x2"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32x2%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint32x2">§</a></span></dt>
<dd>Defined in <strong title='uint32x2 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint32x2>WebGPU</a></strong> </dd>
<dt id="uint32x3@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32x3"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32x3%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint32x3">§</a></span></dt>
<dd>Defined in <strong title='uint32x3 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint32x3>WebGPU</a></strong> </dd>
<dt id="uint32x4@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint32x4"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint32x4%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint32x4">§</a></span></dt>
<dd>Defined in <strong title='uint32x4 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint32x4>WebGPU</a></strong> </dd>
<dt id="uint64@@MLOperandDataType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint64"</code></strong> (<em>value for <a href='m.html#MLOperandDataType@@@@enum'><code>MLOperandDataType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint64%40%40MLOperandDataType%40enum-value' aria-label="Permalink for uint64">§</a></span></dt>
<dd>Defined in <strong title='uint64 is defined in Web Neural Network API'><a href=https://webmachinelearning.github.io/webnn/#dom-mloperanddatatype-uint64>Web Neural Network API</a></strong> </dd>
<dt id="uint8@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint8"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint8%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint8">§</a></span></dt>
<dd>Defined in <strong title='uint8 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint8>WebGPU</a></strong> </dd>
<dt id="uint8@@MLOperandDataType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint8"</code></strong> (<em>value for <a href='m.html#MLOperandDataType@@@@enum'><code>MLOperandDataType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint8%40%40MLOperandDataType%40enum-value' aria-label="Permalink for uint8">§</a></span></dt>
<dd>Defined in <strong title='uint8 is defined in Web Neural Network API'><a href=https://webmachinelearning.github.io/webnn/#dom-mloperanddatatype-uint8>Web Neural Network API</a></strong> </dd>
<dt id="Uint8Array@@@@interface"><code class=prefix></code><span><strong><code class=webidl>Uint8Array</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#Uint8Array%40%40%40%40interface' aria-label="Permalink for Uint8Array">§</a></span></dt>
<dd>Defined in <strong title='Uint8Array is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#idl-Uint8Array>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://compression.spec.whatwg.org/ title='Uint8Array is referenced by Compression'>Compression</a>,
<a href=https://encoding.spec.whatwg.org/ title='Uint8Array is referenced by Encoding'>Encoding</a>,
<a href=https://fetch.spec.whatwg.org/ title='Uint8Array is referenced by Fetch'>Fetch</a>,
<a href=https://webbluetoothcg.github.io/web-bluetooth/ title='Uint8Array is referenced by Web Bluetooth'>Web Bluetooth</a>,
<a href=https://wicg.github.io/direct-sockets/ title='Uint8Array is referenced by Direct Sockets API'>Direct Sockets API</a>,
<a href=https://wicg.github.io/serial/ title='Uint8Array is referenced by Web Serial API'>Web Serial API</a>,
<a href=https://wicg.github.io/turtledove/ title='Uint8Array is referenced by Protected Audience'>Protected Audience</a>,
<a href=https://wicg.github.io/webpackage/loading.html title='Uint8Array is referenced by Loading Signed Exchanges'>Loading Signed Exchanges</a>,
<a href=https://w3c.github.io/attribution/ title='Uint8Array is referenced by Attribution 1'>Attribution 1</a>,
<a href=https://w3ctag.github.io/design-principles/ title='Uint8Array is referenced by Web Platform Design Principles'>Web Platform Design Principles</a>,
<a href=https://w3c.github.io/FileAPI/ title='Uint8Array is referenced by File API'>File API</a>,
<a href=https://w3c.github.io/IndexedDB/ title='Uint8Array is referenced by Indexed DB 3.0'>Indexed DB 3.0</a>,
<a href=https://w3c.github.io/push-api/ title='Uint8Array is referenced by Push API'>Push API</a>,
<a href=https://w3c.github.io/ServiceWorker/ title='Uint8Array is referenced by Service Workers Nightly'>Service Workers Nightly</a>,
<a href=https://webaudio.github.io/web-audio-api/ title='Uint8Array is referenced by Web Audio API'>Web Audio API</a>,
<a href=https://webaudio.github.io/web-audio-api/ title='Uint8Array is referenced by Web Audio API 1.1'>Web Audio API 1.1</a>,
<a href=https://w3c.github.io/webcrypto/ title='Uint8Array is referenced by Web Cryptography 2'>Web Cryptography 2</a>,
<a href=https://webaudio.github.io/web-midi-api/ title='Uint8Array is referenced by Web MIDI API'>Web MIDI API</a>,
<a href=https://webmachinelearning.github.io/webnn/ title='Uint8Array is referenced by Web Neural Network API'>Web Neural Network API</a>,
<a href=https://w3c.github.io/webtransport/ title='Uint8Array is referenced by WebTransport'>WebTransport</a></dd>
<dd>Related terms: <code>Uint8Array.</code><a href='f.html#fromBase64(string, options)@@Uint8Array@method'><code>fromBase64(string, options)</code></a>, <code>Uint8Array.</code><a href='f.html#fromHex(string)@@Uint8Array@method'><code>fromHex(string)</code></a>, <code>Uint8Array.</code><a href='s.html#setFromBase64(string, options)@@Uint8Array@method'><code>setFromBase64(string, options)</code></a>, <code>Uint8Array.</code><a href='s.html#setFromHex(string)@@Uint8Array@method'><code>setFromHex(string)</code></a>, <code>Uint8Array.</code><a href='t.html#toBase64(options)@@Uint8Array@method'><code>toBase64(options)</code></a>, <code>Uint8Array.</code><a href='t.html#toHex()@@Uint8Array@method'><code>toHex()</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/Uint8Array.html' title='Uint8Array entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="%Uint8Array%@@@@interface"><code class=prefix></code><span><strong><code class=webidl>%Uint8Array%</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#%25Uint8Array%25%40%40%40%40interface' aria-label="Permalink for %Uint8Array%">§</a></span></dt>
<dd>Defined in <strong title='%Uint8Array% is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-objects>ECMAScript</a></strong> </dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/%Uint8Array%.html' title='%Uint8Array% entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="Uint8ClampedArray@@@@interface"><code class=prefix></code><span><strong><code class=webidl>Uint8ClampedArray</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#Uint8ClampedArray%40%40%40%40interface' aria-label="Permalink for Uint8ClampedArray">§</a></span></dt>
<dd>Defined in <strong title='Uint8ClampedArray is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#idl-Uint8ClampedArray>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://html.spec.whatwg.org/multipage/ title='Uint8ClampedArray is referenced by HTML'>HTML</a>,
<a href=https://w3c.github.io/webcrypto/ title='Uint8ClampedArray is referenced by Web Cryptography 2'>Web Cryptography 2</a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/Uint8ClampedArray.html' title='Uint8ClampedArray entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="%Uint8ClampedArray%@@@@interface"><code class=prefix></code><span><strong><code class=webidl>%Uint8ClampedArray%</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#%25Uint8ClampedArray%25%40%40%40%40interface' aria-label="Permalink for %Uint8ClampedArray%">§</a></span></dt>
<dd>Defined in <strong title='%Uint8ClampedArray% is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/indexed-collections.html#sec-typedarray-objects>ECMAScript</a></strong> </dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/%Uint8ClampedArray%.html' title='%Uint8ClampedArray% entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="uint8x2@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint8x2"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint8x2%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint8x2">§</a></span></dt>
<dd>Defined in <strong title='uint8x2 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint8x2>WebGPU</a></strong> </dd>
<dt id="uint8x4@@GPUVertexFormat@enum-value"><code class=prefix></code><span><strong><code class=webidl>"uint8x4"</code></strong> (<em>value for <a href='g.html#GPUVertexFormat@@@@enum'><code>GPUVertexFormat</code></a> WebIDL enumeration</em>) <a class='self-link' href='#uint8x4%40%40GPUVertexFormat%40enum-value' aria-label="Permalink for uint8x4">§</a></span></dt>
<dd>Defined in <strong title='uint8x4 is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuvertexformat-uint8x4>WebGPU</a></strong> </dd>
<dt id="ul@@html%%element"><code class=prefix></code><span><strong><code class=markup>ul</code></strong> (<em>markup element</em>) <a class='self-link' href='#ul%40%40html%25%25element' aria-label="Permalink for ul">§</a></span></dt>
<dd>Defined in <strong title='ul is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/grouping-content.html#the-ul-element>HTML</a></strong> </dd>
<dd>Referenced in
<a href=https://w3c.github.io/editing/docs/execCommand/ title='ul is referenced by execCommand'>execCommand</a>,
<a href=https://drafts.csswg.org/css-lists-3/ title='ul is referenced by CSS Lists 3'>CSS Lists 3</a>,
<a href=https://w3c.github.io/html-aam/ title='ul is referenced by HTML Accessibility API Mappings 1.0'>HTML Accessibility API Mappings 1.0</a>,
<a href=https://w3c.github.io/html-aria/ title='ul is referenced by ARIA in HTML'>ARIA in HTML</a>,
<a href=https://w3c.github.io/pub-manifest/ title='ul is referenced by Publication Manifest'>Publication Manifest</a>,
<a href=https://w3c.github.io/aria/ title='ul is referenced by WAI-ARIA'>WAI-ARIA</a>,
<a href=https://w3c.github.io/aria/ title='ul is referenced by WAI-ARIA'>WAI-ARIA</a></dd>
<dd>Related terms: <em>markup attribute</em> <a href='c.html#compact@@ul@element-attr'><code>compact</code></a>, <em>markup attribute</em> <a href='t.html#type@@ul@element-attr'><code>type</code></a></dd>
<dt id="ULongRange@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>ULongRange</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#ULongRange%40%40%40%40dictionary' aria-label="Permalink for ULongRange">§</a></span></dt>
<dd>Defined in <strong title='ULongRange is defined in Media Capture and Streams'><a href=https://w3c.github.io/mediacapture-main/#dom-ulongrange>Media Capture and Streams</a></strong> </dd>
<dd>Related terms: <code>ULongRange.</code><a href='m.html#max@@ULongRange@dict-member'><code>max</code></a>, <code>ULongRange.</code><a href='m.html#min@@ULongRange@dict-member'><code>min</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/ULongRange.html' title='ULongRange entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="ultimate originating element@@selectors%%dfn"><code class=prefix></code><span><strong>ultimate originating element</strong> (<em>concept</em>) <a class='self-link' href='#ultimate%20originating%20element%40%40selectors%25%25dfn' aria-label="Permalink for ultimate originating element">§</a></span></dt>
<dd>Defined in <strong title='ultimate originating element is defined in Selectors 4'><a href=https://drafts.csswg.org/selectors-4/#ultimate-originating-element>Selectors 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-pseudo-4/ title='ultimate originating element is referenced by CSS Pseudo-Elements 4'>CSS Pseudo-Elements 4</a>,
<a href=https://drafts.csswg.org/css-values-5/ title='ultimate originating element is referenced by CSS Values 5'>CSS Values 5</a>,
<a href=https://drafts.csswg.org/css-view-transitions-1/ title='ultimate originating element is referenced by CSS View Transitions 1'>CSS View Transitions 1</a>,
<a href=https://drafts.csswg.org/css-view-transitions-2/ title='ultimate originating element is referenced by CSS View Transitions 2'>CSS View Transitions 2</a></dd>
<dt id="ultra-condensed@@CanvasFontStretch@enum-value"><code class=prefix></code><span><strong><code class=webidl>"ultra-condensed"</code></strong> (<em>value for <a href='c.html#CanvasFontStretch@@@@enum'><code>CanvasFontStretch</code></a> WebIDL enumeration</em>) <a class='self-link' href='#ultra-condensed%40%40CanvasFontStretch%40enum-value' aria-label="Permalink for ultra-condensed">§</a></span></dt>
<dd>Defined in <strong title='ultra-condensed is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-fontstretch-ultra-condensed>HTML</a></strong> </dd>
<dt id="ultra-condensed@@font-width@value"><code class=prefix></code><span><strong><code class=css>ultra-condensed</code></strong> (<em>CSS value for <a href='f.html#font-width@@@@property'><code>font-width</code></a> </em>) <a class='self-link' href='#ultra-condensed%40%40font-width%40value' aria-label="Permalink for ultra-condensed">§</a></span></dt>
<dd>Defined in <strong title='ultra-condensed is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-width-ultra-condensed>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ultra-condensed is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ultra-condensed is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ultra-condensed is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="ultra-expanded@@CanvasFontStretch@enum-value"><code class=prefix></code><span><strong><code class=webidl>"ultra-expanded"</code></strong> (<em>value for <a href='c.html#CanvasFontStretch@@@@enum'><code>CanvasFontStretch</code></a> WebIDL enumeration</em>) <a class='self-link' href='#ultra-expanded%40%40CanvasFontStretch%40enum-value' aria-label="Permalink for ultra-expanded">§</a></span></dt>
<dd>Defined in <strong title='ultra-expanded is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-fontstretch-ultra-expanded>HTML</a></strong> </dd>
<dt id="ultra-expanded@@font-width@value"><code class=prefix></code><span><strong><code class=css>ultra-expanded</code></strong> (<em>CSS value for <a href='f.html#font-width@@@@property'><code>font-width</code></a> </em>) <a class='self-link' href='#ultra-expanded%40%40font-width%40value' aria-label="Permalink for ultra-expanded">§</a></span></dt>
<dd>Defined in <strong title='ultra-expanded is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-width-ultra-expanded>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='ultra-expanded is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='ultra-expanded is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='ultra-expanded is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="un-initialized value@@uievents%%dfn"><code class=prefix></code><span><strong>un-initialized value</strong> (<em>concept</em>) <a class='self-link' href='#un-initialized%20value%40%40uievents%25%25dfn' aria-label="Permalink for un-initialized value">§</a></span></dt>
<dd>Defined in <strong title='un-initialized value is defined in UI Events'><a href=https://w3c.github.io/uievents/#un-initialized-value>UI Events</a></strong> </dd>
<dt id="unable to close browser@@errors@dfn"><code class=prefix></code><span><strong>unable to close browser</strong> (<em>concept for <a href='e.html#[[errors]]@@GPU error scope@attribute'><code>[[errors]]</code></a> </em>) <a class='self-link' href='#unable%20to%20close%20browser%40%40errors%40dfn' aria-label="Permalink for unable to close browser">§</a></span></dt>
<dd>Defined in <strong title='unable to close browser is defined in WebDriver BiDi'><a href=https://w3c.github.io/webdriver-bidi/#errors-unable-to-close-browser>WebDriver BiDi</a></strong> </dd>
<dt id="unable to set cookie@@errors@dfn"><code class=prefix></code><span><strong>unable to set cookie</strong> (<em>concept for <a href='e.html#[[errors]]@@GPU error scope@attribute'><code>[[errors]]</code></a> </em>) <a class='self-link' href='#unable%20to%20set%20cookie%40%40errors%40dfn' aria-label="Permalink for unable to set cookie">§</a></span></dt>
<dd>Defined in <strong title='unable to set cookie is defined in WebDriver BiDi'><a href=https://w3c.github.io/webdriver-bidi/#errors-unable-to-set-cookie>WebDriver BiDi</a></strong> </dd>
<dt id="unable to set file input@@errors@dfn"><code class=prefix></code><span><strong>unable to set file input</strong> (<em>concept for <a href='e.html#[[errors]]@@GPU error scope@attribute'><code>[[errors]]</code></a> </em>) <a class='self-link' href='#unable%20to%20set%20file%20input%40%40errors%40dfn' aria-label="Permalink for unable to set file input">§</a></span></dt>
<dd>Defined in <strong title='unable to set file input is defined in WebDriver BiDi'><a href=https://w3c.github.io/webdriver-bidi/#errors-unable-to-set-file-input>WebDriver BiDi</a></strong> </dd>
<dt id="unadjustedMovement@@PointerLockOptions@dict-member"><code class=prefix><a href='p.html#PointerLockOptions@@@@dictionary'>PointerLockOptions</a>.</code><span><strong><code class=webidl>unadjustedMovement</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#unadjustedMovement%40%40PointerLockOptions%40dict-member' aria-label="Permalink for <a href='p.html#PointerLockOptions@@@@dictionary'>PointerLockOptions</a>.unadjustedMovement">§</a></span></dt>
<dd>Defined in <strong title='unadjustedMovement is defined in Pointer Lock 2.0'><a href=https://w3c.github.io/pointerlock/#dom-pointerlockoptions-unadjustedmovement>Pointer Lock 2.0</a></strong> </dd>
<dt id="unambiguously links to a source map@@ecma-426%%dfn"><code class=prefix></code><span><strong>unambiguously links to a source map</strong> (<em>concept</em>) <a class='self-link' href='#unambiguously%20links%20to%20a%20source%20map%40%40ecma-426%25%25dfn' aria-label="Permalink for unambiguously links to a source map">§</a></span></dt>
<dd>Defined in <strong title='unambiguously links to a source map is defined in Source map format'><a href=https://tc39.es/ecma426/#umambiguous-linking>Source map format</a></strong> </dd>
<dt id="unauthenticated response@@mixed-content%%dfn"><code class=prefix></code><span><strong>unauthenticated response</strong> (<em>concept</em>) <a class='self-link' href='#unauthenticated%20response%40%40mixed-content%25%25dfn' aria-label="Permalink for unauthenticated response">§</a></span></dt>
<dd>Defined in <strong title='unauthenticated response is defined in Mixed Content'><a href=https://w3c.github.io/webappsec-mixed-content/#unauthenticated-response>Mixed Content</a></strong> </dd>
<dt id="unavailable@@AvailabilityStatus@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable"</code></strong> (<em>value for <a href='a.html#AvailabilityStatus@@@@enum'><code>AvailabilityStatus</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable%40%40AvailabilityStatus%40enum-value' aria-label="Permalink for unavailable">§</a></span></dt>
<dd>Defined in <strong title='unavailable is defined in Web Speech API'><a href=https://webaudio.github.io/web-speech-api/#dom-availabilitystatus-unavailable>Web Speech API</a></strong> </dd>
<dt id="unavailable@@Availability@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable"</code></strong> (<em>value for <a href='a.html#Availability@@@@enum'><code>Availability</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable%40%40Availability%40enum-value' aria-label="Permalink for unavailable">§</a></span></dt>
<dd>Defined in <strong title='unavailable is defined in Writing Assistance APIs'><a href=https://webmachinelearning.github.io/writing-assistance-apis/#dom-availability-unavailable>Writing Assistance APIs</a></strong> </dd>
<dd>Referenced in
<a href=https://webmachinelearning.github.io/translation-api/ title='unavailable is referenced by Translator and Language Detector APIs'>Translator and Language Detector APIs</a></dd>
<dt id="unavailable@@SmartCardReaderStateFlagsIn@dict-member"><code class=prefix><a href='s.html#SmartCardReaderStateFlagsIn@@@@dictionary'>SmartCardReaderStateFlagsIn</a>.</code><span><strong><code class=webidl>unavailable</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#unavailable%40%40SmartCardReaderStateFlagsIn%40dict-member' aria-label="Permalink for <a href='s.html#SmartCardReaderStateFlagsIn@@@@dictionary'>SmartCardReaderStateFlagsIn</a>.unavailable">§</a></span></dt>
<dd>Defined in <strong title='unavailable is defined in Web Smart Card API'><a href=https://wicg.github.io/web-smart-card/#dom-smartcardreaderstateflagsin-unavailable>Web Smart Card API</a></strong> </dd>
<dt id="unavailable@@SmartCardReaderStateFlagsOut@dict-member"><code class=prefix><a href='s.html#SmartCardReaderStateFlagsOut@@@@dictionary'>SmartCardReaderStateFlagsOut</a>.</code><span><strong><code class=webidl>unavailable</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#unavailable%40%40SmartCardReaderStateFlagsOut%40dict-member' aria-label="Permalink for <a href='s.html#SmartCardReaderStateFlagsOut@@@@dictionary'>SmartCardReaderStateFlagsOut</a>.unavailable">§</a></span></dt>
<dd>Defined in <strong title='unavailable is defined in Web Smart Card API'><a href=https://wicg.github.io/web-smart-card/#dom-smartcardreaderstateflagsout-unavailable>Web Smart Card API</a></strong> </dd>
<dt id="unavailable network data@@errors@dfn"><code class=prefix></code><span><strong>unavailable network data</strong> (<em>concept for <a href='e.html#[[errors]]@@GPU error scope@attribute'><code>[[errors]]</code></a> </em>) <a class='self-link' href='#unavailable%20network%20data%40%40errors%40dfn' aria-label="Permalink for unavailable network data">§</a></span></dt>
<dd>Defined in <strong title='unavailable network data is defined in WebDriver BiDi'><a href=https://w3c.github.io/webdriver-bidi/#errors-unavailable-network-data>WebDriver BiDi</a></strong> </dd>
<dt id="unavailable-feature-not-enabled@@SecurePaymentConfirmationAvailability@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable-feature-not-enabled"</code></strong> (<em>value for <a href='s.html#SecurePaymentConfirmationAvailability@@@@enum'><code>SecurePaymentConfirmationAvailability</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable-feature-not-enabled%40%40SecurePaymentConfirmationAvailability%40enum-value' aria-label="Permalink for unavailable-feature-not-enabled">§</a></span></dt>
<dd>Defined in <strong title='unavailable-feature-not-enabled is defined in Secure Payment Confirmation'><a href=https://w3c.github.io/secure-payment-confirmation/#dom-securepaymentconfirmationavailability-unavailable-feature-not-enabled>Secure Payment Confirmation</a></strong> </dd>
<dt id="unavailable-no-permission-policy@@SecurePaymentConfirmationAvailability@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable-no-permission-policy"</code></strong> (<em>value for <a href='s.html#SecurePaymentConfirmationAvailability@@@@enum'><code>SecurePaymentConfirmationAvailability</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable-no-permission-policy%40%40SecurePaymentConfirmationAvailability%40enum-value' aria-label="Permalink for unavailable-no-permission-policy">§</a></span></dt>
<dd>Defined in <strong title='unavailable-no-permission-policy is defined in Secure Payment Confirmation'><a href=https://w3c.github.io/secure-payment-confirmation/#dom-securepaymentconfirmationavailability-unavailable-no-permission-policy>Secure Payment Confirmation</a></strong> </dd>
<dt id="unavailable-no-user-verifying-platform-authenticator@@SecurePaymentConfirmationAvailability@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable-no-user-verifying-platform-authenticator"</code></strong> (<em>value for <a href='s.html#SecurePaymentConfirmationAvailability@@@@enum'><code>SecurePaymentConfirmationAvailability</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable-no-user-verifying-platform-authenticator%40%40SecurePaymentConfirmationAvailability%40enum-value' aria-label="Permalink for unavailable-no-user-verifying-platform-authenticator">§</a></span></dt>
<dd>Defined in <strong title='unavailable-no-user-verifying-platform-authenticator is defined in Secure Payment Confirmation'><a href=https://w3c.github.io/secure-payment-confirmation/#dom-securepaymentconfirmationavailability-unavailable-no-user-verifying-platform-authenticator>Secure Payment Confirmation</a></strong> </dd>
<dt id="unavailable-unknown-reason@@SecurePaymentConfirmationAvailability@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unavailable-unknown-reason"</code></strong> (<em>value for <a href='s.html#SecurePaymentConfirmationAvailability@@@@enum'><code>SecurePaymentConfirmationAvailability</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unavailable-unknown-reason%40%40SecurePaymentConfirmationAvailability%40enum-value' aria-label="Permalink for unavailable-unknown-reason">§</a></span></dt>
<dd>Defined in <strong title='unavailable-unknown-reason is defined in Secure Payment Confirmation'><a href=https://w3c.github.io/secure-payment-confirmation/#dom-securepaymentconfirmationavailability-unavailable-unknown-reason>Secure Payment Confirmation</a></strong> </dd>
<dt id="unaware@@SmartCardReaderStateFlagsIn@dict-member"><code class=prefix><a href='s.html#SmartCardReaderStateFlagsIn@@@@dictionary'>SmartCardReaderStateFlagsIn</a>.</code><span><strong><code class=webidl>unaware</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#unaware%40%40SmartCardReaderStateFlagsIn%40dict-member' aria-label="Permalink for <a href='s.html#SmartCardReaderStateFlagsIn@@@@dictionary'>SmartCardReaderStateFlagsIn</a>.unaware">§</a></span></dt>
<dd>Defined in <strong title='unaware is defined in Web Smart Card API'><a href=https://wicg.github.io/web-smart-card/#dom-smartcardreaderstateflagsin-unaware>Web Smart Card API</a></strong> </dd>
<dt id="unbounded@@XRReferenceSpaceType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unbounded"</code></strong> (<em>value for <a href='x.html#XRReferenceSpaceType@@@@enum'><code>XRReferenceSpaceType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unbounded%40%40XRReferenceSpaceType%40enum-value' aria-label="Permalink for unbounded">§</a></span></dt>
<dd>Defined in <strong title='unbounded is defined in WebXR Device API'><a href=https://immersive-web.github.io/webxr/#dom-xrreferencespacetype-unbounded>WebXR Device API</a></strong> </dd>
<dd>Referenced in
<a href=https://immersive-web.github.io/layers/ title='unbounded is referenced by WebXR Layers API 1'>WebXR Layers API 1</a></dd>
<dt id="UncalibratedMagnetometer@@@@interface"><code class=prefix></code><span><strong><code class=webidl>UncalibratedMagnetometer</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#UncalibratedMagnetometer%40%40%40%40interface' aria-label="Permalink for UncalibratedMagnetometer">§</a></span></dt>
<dd>Defined in <strong title='UncalibratedMagnetometer is defined in Magnetometer'><a href=https://w3c.github.io/magnetometer/#uncalibratedmagnetometer>Magnetometer</a></strong> </dd>
<dd>Related terms: <code>UncalibratedMagnetometer.</code><a href='x.html#x@@UncalibratedMagnetometer@attribute'><code>x</code></a>, <code>UncalibratedMagnetometer.</code><a href='x.html#xBias@@UncalibratedMagnetometer@attribute'><code>xBias</code></a>, <code>UncalibratedMagnetometer.</code><a href='y.html#y@@UncalibratedMagnetometer@attribute'><code>y</code></a>, <code>UncalibratedMagnetometer.</code><a href='y.html#yBias@@UncalibratedMagnetometer@attribute'><code>yBias</code></a>, <code>UncalibratedMagnetometer.</code><a href='z.html#z@@UncalibratedMagnetometer@attribute'><code>z</code></a>, <code>UncalibratedMagnetometer.</code><a href='z.html#zBias@@UncalibratedMagnetometer@attribute'><code>zBias</code></a>, <code>new </code><a href='u.html#UncalibratedMagnetometer(sensorOptions)@@UncalibratedMagnetometer@constructor'><code>UncalibratedMagnetometer(sensorOptions)</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UncalibratedMagnetometer.html' title='UncalibratedMagnetometer entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UncalibratedMagnetometer(sensorOptions)@@UncalibratedMagnetometer@constructor"><code class=prefix>new </code><span><strong><code class=webidl>UncalibratedMagnetometer(sensorOptions)</code></strong> (<em>WebIDL constructor</em>) <a class='self-link' href='#UncalibratedMagnetometer(sensorOptions)%40%40UncalibratedMagnetometer%40constructor' aria-label="Permalink for new UncalibratedMagnetometer(sensorOptions)">§</a></span></dt>
<dd>Defined in <strong title='UncalibratedMagnetometer(sensorOptions) is defined in Magnetometer'><a href=https://w3c.github.io/magnetometer/#dom-uncalibratedmagnetometer-uncalibratedmagnetometer>Magnetometer</a></strong> </dd>
<dt id="uncapturederror@@GPUDevice@event"><code class=prefix></code><span><strong><code class=webidl>uncapturederror</code></strong> (<em>event for <a href='g.html#GPUDevice@@@@interface'><code>GPUDevice</code></a> </em>) <a class='self-link' href='#uncapturederror%40%40GPUDevice%40event' aria-label="Permalink for uncapturederror">§</a></span></dt>
<dd>Defined in <strong title='uncapturederror is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#eventdef-gpudevice-uncapturederror>WebGPU</a></strong> </dd>
<dt id=":unchecked@@@@selector"><code class=prefix></code><span><strong><code class=css>:unchecked</code></strong> (<em>CSS selector</em>) <a class='self-link' href='#%3Aunchecked%40%40%40%40selector' aria-label="Permalink for :unchecked">§</a></span></dt>
<dd>Defined in <strong title=':unchecked is defined in Selectors 4'><a href=https://drafts.csswg.org/selectors-4/#unchecked-pseudo>Selectors 4</a></strong> </dd>
<dt id="unclippedDepth@@GPUPrimitiveState@dict-member"><code class=prefix><a href='g.html#GPUPrimitiveState@@@@dictionary'>GPUPrimitiveState</a>.</code><span><strong><code class=webidl>unclippedDepth</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#unclippedDepth%40%40GPUPrimitiveState%40dict-member' aria-label="Permalink for <a href='g.html#GPUPrimitiveState@@@@dictionary'>GPUPrimitiveState</a>.unclippedDepth">§</a></span></dt>
<dd>Defined in <strong title='unclippedDepth is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpuprimitivestate-unclippeddepth>WebGPU</a></strong> </dd>
<dt id="unconfigure()@@GPUCanvasContext@method"><code class=prefix><a href='g.html#GPUCanvasContext@@@@interface'>GPUCanvasContext</a>.</code><span><strong><code class=webidl>unconfigure()</code></strong> (<em>WebIDL operation</em>) <a class='self-link' href='#unconfigure()%40%40GPUCanvasContext%40method' aria-label="Permalink for <a href='g.html#GPUCanvasContext@@@@interface'>GPUCanvasContext</a>.unconfigure()">§</a></span></dt>
<dd>Defined in <strong title='unconfigure() is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gpucanvascontext-unconfigure>WebGPU</a></strong> </dd>
<dt id="unconfigured@@CodecState@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unconfigured"</code></strong> (<em>value for <a href='c.html#CodecState@@@@enum'><code>CodecState</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unconfigured%40%40CodecState%40enum-value' aria-label="Permalink for unconfigured">§</a></span></dt>
<dd>Defined in <strong title='unconfigured is defined in WebCodecs'><a href=https://w3c.github.io/webcodecs/#dom-codecstate-unconfigured>WebCodecs</a></strong> </dd>
<dt id="undefined@@@@interface"><code class=prefix></code><span><strong><code class=webidl>undefined</code></strong> (<em>WebIDL interface</em>) <a class='self-link' href='#undefined%40%40%40%40interface' aria-label="Permalink for undefined">§</a></span></dt>
<dd>Defined in <strong title='undefined is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#idl-undefined>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://console.spec.whatwg.org/ title='undefined is referenced by Console'>Console</a>,
<a href=https://cookiestore.spec.whatwg.org/ title='undefined is referenced by Cookie Store API'>Cookie Store API</a>,
<a href=https://dom.spec.whatwg.org/ title='undefined is referenced by DOM'>DOM</a>,
<a href=https://fetch.spec.whatwg.org/ title='undefined is referenced by Fetch'>Fetch</a>,
<a href=https://fs.spec.whatwg.org/ title='undefined is referenced by File System'>File System</a>,
<a href=https://fullscreen.spec.whatwg.org/ title='undefined is referenced by Fullscreen API'>Fullscreen API</a>,
<a href=https://immersive-web.github.io/anchors/ title='undefined is referenced by WebXR Anchors'>WebXR Anchors</a>,
<a href=https://immersive-web.github.io/model-element/ title='undefined is referenced by The <model> element'>The <model> element</a>,
<a href=https://immersive-web.github.io/plane-detection/ title='undefined is referenced by WebXR Plane Detection'>WebXR Plane Detection</a>,
<a href=https://notifications.spec.whatwg.org/ title='undefined is referenced by Notifications API'>Notifications API</a>,
<a href=https://patcg-individual-drafts.github.io/private-aggregation-api/ title='undefined is referenced by Private Aggregation API'>Private Aggregation API</a>,
<a href=https://privacycg.github.io/requestStorageAccessFor/ title='undefined is referenced by requestStorageAccessFor API'>requestStorageAccessFor API</a>,
<a href=https://privacycg.github.io/saa-non-cookie-storage/ title='undefined is referenced by Extending Storage Access API to non-cookie storage'>Extending Storage Access API to non-cookie storage</a>,
<a href=https://privacycg.github.io/storage-access/ title='undefined is referenced by The Storage Access API'>The Storage Access API</a>,
<a href=https://screen-share.github.io/element-capture/ title='undefined is referenced by Element Capture'>Element Capture</a>,
<a href=https://streams.spec.whatwg.org/ title='undefined is referenced by Streams'>Streams</a>,
<a href=https://testutils.spec.whatwg.org/ title='undefined is referenced by Test Utils'>Test Utils</a>,
<a href=https://url.spec.whatwg.org/ title='undefined is referenced by URL'>URL</a>,
<a href=https://urlpattern.spec.whatwg.org/ title='undefined is referenced by URL Pattern'>URL Pattern</a>,
<a href=https://w3c-fedid.github.io/login-status/ title='undefined is referenced by Login Status API'>Login Status API</a>,
<a href=https://w3c.github.io/mediacapture-handle/actions/ title='undefined is referenced by The Capture-Handle Actions Mechanism'>The Capture-Handle Actions Mechanism</a>,
<a href=https://w3c.github.io/mediacapture-surface-control/ title='undefined is referenced by Captured Surface Control'>Captured Surface Control</a>,
<a href=https://w3c.github.io/web-nfc/ title='undefined is referenced by Web NFC'>Web NFC</a>,
<a href=https://w3c.github.io/webrtc-ice/ title='undefined is referenced by IceTransport Extensions for WebRTC'>IceTransport Extensions for WebRTC</a>,
<a href=https://webassembly.github.io/content-security-policy/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: Content Security Policy'>WebAssembly JavaScript Interface: Content Security Policy</a>,
<a href=https://webassembly.github.io/esm-integration/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: ESM Integration'>WebAssembly JavaScript Interface: ESM Integration</a>,
<a href=https://webassembly.github.io/exception-handling/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: Exception Handling'>WebAssembly JavaScript Interface: Exception Handling</a>,
<a href=https://webassembly.github.io/js-promise-integration/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: Promise Integration'>WebAssembly JavaScript Interface: Promise Integration</a>,
<a href=https://webassembly.github.io/js-string-builtins/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: JS String Builtins'>WebAssembly JavaScript Interface: JS String Builtins</a>,
<a href=https://webassembly.github.io/js-types/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface: Type Reflection'>WebAssembly JavaScript Interface: Type Reflection</a>,
<a href=https://webaudio.github.io/web-speech-api/ title='undefined is referenced by Web Speech API'>Web Speech API</a>,
<a href=https://webbluetoothcg.github.io/web-bluetooth/ title='undefined is referenced by Web Bluetooth'>Web Bluetooth</a>,
<a href=https://webbluetoothcg.github.io/web-bluetooth/scanning.html title='undefined is referenced by Web Bluetooth Scanning'>Web Bluetooth Scanning</a>,
<a href=https://webmachinelearning.github.io/webmcp/ title='undefined is referenced by WebMCP'>WebMCP</a>,
<a href=https://webmachinelearning.github.io/writing-assistance-apis/ title='undefined is referenced by Writing Assistance APIs'>Writing Assistance APIs</a>,
<a href=https://websockets.spec.whatwg.org/ title='undefined is referenced by WebSockets'>WebSockets</a>,
<a href=https://wicg.github.io/attribution-reporting-api/ title='undefined is referenced by Attribution Reporting'>Attribution Reporting</a>,
<a href=https://wicg.github.io/audio-context-playout-stats/ title='undefined is referenced by Playout Statistics API for WebAudio'>Playout Statistics API for WebAudio</a>,
<a href=https://wicg.github.io/autofill-event/ title='undefined is referenced by Autofill Event'>Autofill Event</a>,
<a href=https://wicg.github.io/background-sync/spec/ title='undefined is referenced by Background Sync'>Background Sync</a>,
<a href=https://wicg.github.io/crash-reporting/ title='undefined is referenced by Crash Reporting'>Crash Reporting</a>,
<a href=https://wicg.github.io/digital-goods/ title='undefined is referenced by Digital Goods API'>Digital Goods API</a>,
<a href=https://wicg.github.io/direct-sockets/ title='undefined is referenced by Direct Sockets API'>Direct Sockets API</a>,
<a href=https://wicg.github.io/entries-api/ title='undefined is referenced by File and Directory Entries API'>File and Directory Entries API</a>,
<a href=https://wicg.github.io/fenced-frame/ title='undefined is referenced by Fenced Frame'>Fenced Frame</a>,
<a href=https://wicg.github.io/handwriting-recognition/ title='undefined is referenced by Handwriting Recognition API'>Handwriting Recognition API</a>,
<a href=https://wicg.github.io/idle-detection/ title='undefined is referenced by Idle Detection API'>Idle Detection API</a>,
<a href=https://wicg.github.io/ink-enhancement/ title='undefined is referenced by Ink API'>Ink API</a>,
<a href=https://wicg.github.io/nav-speculation/prerendering.html title='undefined is referenced by Prerendering Revamped'>Prerendering Revamped</a>,
<a href=https://wicg.github.io/observable/ title='undefined is referenced by Observable'>Observable</a>,
<a href=https://wicg.github.io/sanitizer-api/ title='undefined is referenced by HTML Sanitizer API'>HTML Sanitizer API</a>,
<a href=https://wicg.github.io/scheduling-apis/ title='undefined is referenced by Prioritized Task Scheduling'>Prioritized Task Scheduling</a>,
<a href=https://wicg.github.io/serial/ title='undefined is referenced by Web Serial API'>Web Serial API</a>,
<a href=https://wicg.github.io/shared-storage/ title='undefined is referenced by Shared Storage API'>Shared Storage API</a>,
<a href=https://wicg.github.io/storage-buckets/ title='undefined is referenced by Storage Buckets API'>Storage Buckets API</a>,
<a href=https://wicg.github.io/trust-token-api/ title='undefined is referenced by Private State Token API'>Private State Token API</a>,
<a href=https://wicg.github.io/turtledove/ title='undefined is referenced by Protected Audience'>Protected Audience</a>,
<a href=https://wicg.github.io/video-rvfc/ title='undefined is referenced by HTMLVideoElement.requestVideoFrameCallback()'>HTMLVideoElement.requestVideoFrameCallback()</a>,
<a href=https://wicg.github.io/web-app-launch/ title='undefined is referenced by Web App Launch Handler API'>Web App Launch Handler API</a>,
<a href=https://wicg.github.io/web-smart-card/ title='undefined is referenced by Web Smart Card API'>Web Smart Card API</a>,
<a href=https://wicg.github.io/WebApiDevice/device_attributes/ title='undefined is referenced by Device Attributes API'>Device Attributes API</a>,
<a href=https://wicg.github.io/webhid/ title='undefined is referenced by WebHID API'>WebHID API</a>,
<a href=https://wicg.github.io/webusb/ title='undefined is referenced by WebUSB API'>WebUSB API</a>,
<a href=https://w3c.github.io/mediacapture-output/ title='undefined is referenced by Audio Output Devices API'>Audio Output Devices API</a>,
<a href=https://w3c.github.io/badging/ title='undefined is referenced by Badging API'>Badging API</a>,
<a href=https://w3c.github.io/mediacapture-handle/identity/ title='undefined is referenced by Capture Handle - Bootstrapping Collaboration when Screensharing'>Capture Handle - Bootstrapping Collaboration when Screensharing</a>,
<a href=https://w3c.github.io/clipboard-apis/ title='undefined is referenced by Clipboard API and events'>Clipboard API and events</a>,
<a href=https://w3c.github.io/compute-pressure/ title='undefined is referenced by Compute Pressure 1'>Compute Pressure 1</a>,
<a href=https://w3c.github.io/webappsec-credential-management/ title='undefined is referenced by Credential Management 1'>Credential Management 1</a>,
<a href=https://drafts.css-houdini.org/css-animationworklet-1/ title='undefined is referenced by CSS Animation Worklet API'>CSS Animation Worklet API</a>,
<a href=https://drafts.csswg.org/css-animations-1/ title='undefined is referenced by CSS Animations 1'>CSS Animations 1</a>,
<a href=https://drafts.csswg.org/css-font-loading-3/ title='undefined is referenced by CSS Font Loading 3'>CSS Font Loading 3</a>,
<a href=https://drafts.csswg.org/css-fonts-4/ title='undefined is referenced by CSS Fonts 4'>CSS Fonts 4</a>,
<a href=https://drafts.css-houdini.org/css-layout-api-1/ title='undefined is referenced by CSS Layout API 1'>CSS Layout API 1</a>,
<a href=https://drafts.csswg.org/css-nav-1/ title='undefined is referenced by CSS Spatial Navigation 1'>CSS Spatial Navigation 1</a>,
<a href=https://drafts.css-houdini.org/css-paint-api-1/ title='undefined is referenced by CSS Painting API 1'>CSS Painting API 1</a>,
<a href=https://drafts.css-houdini.org/css-properties-values-api-1/ title='undefined is referenced by CSS Properties and Values API 1'>CSS Properties and Values API 1</a>,
<a href=https://drafts.css-houdini.org/css-typed-om-1/ title='undefined is referenced by CSS Typed OM 1'>CSS Typed OM 1</a>,
<a href=https://drafts.csswg.org/css-view-transitions-1/ title='undefined is referenced by CSS View Transitions 1'>CSS View Transitions 1</a>,
<a href=https://drafts.csswg.org/css-view-transitions-2/ title='undefined is referenced by CSS View Transitions 2'>CSS View Transitions 2</a>,
<a href=https://drafts.csswg.org/cssom-1/ title='undefined is referenced by CSSOM'>CSSOM</a>,
<a href=https://drafts.csswg.org/cssom-view-1/ title='undefined is referenced by CSSOM View'>CSSOM View</a>,
<a href=https://w3ctag.github.io/design-principles/ title='undefined is referenced by Web Platform Design Principles'>Web Platform Design Principles</a>,
<a href=https://w3c.github.io/edit-context/ title='undefined is referenced by EditContext API'>EditContext API</a>,
<a href=https://w3c.github.io/encrypted-media/ title='undefined is referenced by Encrypted Media Extensions'>Encrypted Media Extensions</a>,
<a href=https://w3c-fedid.github.io/FedCM/ title='undefined is referenced by Federated Credential Management API'>Federated Credential Management API</a>,
<a href=https://w3c.github.io/FileAPI/ title='undefined is referenced by File API'>File API</a>,
<a href=https://drafts.csswg.org/filter-effects-1/ title='undefined is referenced by Filter Effects 1'>Filter Effects 1</a>,
<a href=https://w3c.github.io/sensors/ title='undefined is referenced by Generic Sensor API'>Generic Sensor API</a>,
<a href=https://w3c.github.io/geolocation/ title='undefined is referenced by Geolocation'>Geolocation</a>,
<a href=https://w3c.github.io/IndexedDB/ title='undefined is referenced by Indexed DB 3.0'>Indexed DB 3.0</a>,
<a href=https://w3c.github.io/json-ld-api/ title='undefined is referenced by JSON-LD 1.1 Processing Algorithms and API'>JSON-LD 1.1 Processing Algorithms and API</a>,
<a href=https://w3c.github.io/media-source/ title='undefined is referenced by Media Source Extensions™'>Media Source Extensions™</a>,
<a href=https://w3c.github.io/mediacapture-fromelement/ title='undefined is referenced by Media Capture from DOM Elements'>Media Capture from DOM Elements</a>,
<a href=https://w3c.github.io/mediacapture-region/ title='undefined is referenced by Region Capture'>Region Capture</a>,
<a href=https://w3c.github.io/mediacapture-main/ title='undefined is referenced by Media Capture and Streams'>Media Capture and Streams</a>,
<a href=https://drafts.csswg.org/mediaqueries-5/ title='undefined is referenced by Media Queries 5'>Media Queries 5</a>,
<a href=https://w3c.github.io/mediasession/ title='undefined is referenced by Media Session'>Media Session</a>,
<a href=https://w3c.github.io/mediacapture-record/ title='undefined is referenced by MediaStream Recording'>MediaStream Recording</a>,
<a href=https://w3c.github.io/orientation-sensor/ title='undefined is referenced by Orientation Sensor'>Orientation Sensor</a>,
<a href=https://w3c.github.io/payment-request/ title='undefined is referenced by Payment Request API'>Payment Request API</a>,
<a href=https://w3c.github.io/performance-timeline/ title='undefined is referenced by Performance Timeline'>Performance Timeline</a>,
<a href=https://w3c.github.io/picture-in-picture/ title='undefined is referenced by Picture-in-Picture'>Picture-in-Picture</a>,
<a href=https://www.w3.org/TR/pointerevents3/ title='undefined is referenced by Pointer Events'>Pointer Events</a>,
<a href=https://w3c.github.io/pointerevents/ title='undefined is referenced by Pointer Events'>Pointer Events</a>,
<a href=https://w3c.github.io/pointerlock/ title='undefined is referenced by Pointer Lock 2.0'>Pointer Lock 2.0</a>,
<a href=https://w3c.github.io/presentation-api/ title='undefined is referenced by Presentation API'>Presentation API</a>,
<a href=https://w3c.github.io/remote-playback/ title='undefined is referenced by Remote Playback API'>Remote Playback API</a>,
<a href=https://w3c.github.io/reporting/ title='undefined is referenced by Reporting API'>Reporting API</a>,
<a href=https://w3c.github.io/requestidlecallback/ title='undefined is referenced by requestIdleCallback()'>requestIdleCallback()</a>,
<a href=https://drafts.csswg.org/resize-observer-1/ title='undefined is referenced by Resize Observer'>Resize Observer</a>,
<a href=https://w3c.github.io/resource-timing/ title='undefined is referenced by Resource Timing'>Resource Timing</a>,
<a href=https://w3c.github.io/mediacapture-screen-share/ title='undefined is referenced by Screen Capture'>Screen Capture</a>,
<a href=https://w3c.github.io/screen-orientation/ title='undefined is referenced by Screen Orientation'>Screen Orientation</a>,
<a href=https://w3c.github.io/screen-wake-lock/ title='undefined is referenced by Screen Wake Lock API'>Screen Wake Lock API</a>,
<a href=https://w3c.github.io/selection-api/ title='undefined is referenced by Selection API'>Selection API</a>,
<a href=https://w3c.github.io/ServiceWorker/ title='undefined is referenced by Service Workers Nightly'>Service Workers Nightly</a>,
<a href=https://w3c.github.io/uievents/ title='undefined is referenced by UI Events'>UI Events</a>,
<a href=https://w3c.github.io/user-timing/ title='undefined is referenced by User Timing'>User Timing</a>,
<a href=https://w3c.github.io/virtual-keyboard/ title='undefined is referenced by VirtualKeyboard API'>VirtualKeyboard API</a>,
<a href=https://w3c.github.io/aria/ title='undefined is referenced by WAI-ARIA'>WAI-ARIA</a>,
<a href=https://w3c.github.io/aria/ title='undefined is referenced by WAI-ARIA'>WAI-ARIA</a>,
<a href=https://webassembly.github.io/spec/js-api/ title='undefined is referenced by WebAssembly JavaScript Interface'>WebAssembly JavaScript Interface</a>,
<a href=https://drafts.csswg.org/web-animations-1/ title='undefined is referenced by Web Animations'>Web Animations</a>,
<a href=https://drafts.csswg.org/web-animations-2/ title='undefined is referenced by Web Animations 2'>Web Animations 2</a>,
<a href=https://w3c.github.io/web-based-payment-handler/ title='undefined is referenced by Web-based Payment Handler API'>Web-based Payment Handler API</a>,
<a href=https://w3c.github.io/web-share/ title='undefined is referenced by Web Share API'>Web Share API</a>,
<a href=https://webaudio.github.io/web-audio-api/ title='undefined is referenced by Web Audio API'>Web Audio API</a>,
<a href=https://webaudio.github.io/web-audio-api/ title='undefined is referenced by Web Audio API 1.1'>Web Audio API 1.1</a>,
<a href=https://w3c.github.io/webauthn/ title='undefined is referenced by Web Authentication'>Web Authentication</a>,
<a href=https://w3c.github.io/webcodecs/ title='undefined is referenced by WebCodecs'>WebCodecs</a>,
<a href=https://gpuweb.github.io/gpuweb/ title='undefined is referenced by WebGPU'>WebGPU</a>,
<a href=https://webaudio.github.io/web-midi-api/ title='undefined is referenced by Web MIDI API'>Web MIDI API</a>,
<a href=https://webmachinelearning.github.io/webnn/ title='undefined is referenced by Web Neural Network API'>Web Neural Network API</a>,
<a href=https://w3c.github.io/webrtc-encoded-transform/ title='undefined is referenced by WebRTC Encoded Transform'>WebRTC Encoded Transform</a>,
<a href=https://w3c.github.io/webrtc-identity/ title='undefined is referenced by Identity for WebRTC 1.0'>Identity for WebRTC 1.0</a>,
<a href=https://w3c.github.io/webrtc-pc/ title='undefined is referenced by WebRTC 1.0'>WebRTC 1.0</a>,
<a href=https://w3c.github.io/webtransport/ title='undefined is referenced by WebTransport'>WebTransport</a>,
<a href=https://immersive-web.github.io/depth-sensing/ title='undefined is referenced by WebXR Depth Sensing'>WebXR Depth Sensing</a>,
<a href=https://immersive-web.github.io/hit-test/ title='undefined is referenced by WebXR Hit Test'>WebXR Hit Test</a>,
<a href=https://immersive-web.github.io/webxr/ title='undefined is referenced by WebXR Device API'>WebXR Device API</a>,
<a href=https://immersive-web.github.io/layers/ title='undefined is referenced by WebXR Layers API 1'>WebXR Layers API 1</a>,
<a href=https://xhr.spec.whatwg.org/ title='undefined is referenced by XMLHttpRequest'>XMLHttpRequest</a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/undefined.html' title='undefined entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="undefined@@globalThis@attribute"><code class=prefix><a href='g.html#globalThis@@globalThis@attribute'>globalThis</a>.</code><span><strong><code class=webidl>undefined</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#undefined%40%40globalThis%40attribute' aria-label="Permalink for <a href='g.html#globalThis@@globalThis@attribute'>globalThis</a>.undefined">§</a></span></dt>
<dd>Defined in <strong title='undefined is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/global-object.html#sec-undefined>ECMAScript</a></strong> </dd>
<dt id="under@@ruby-position@value"><code class=prefix></code><span><strong><code class=css>under</code></strong> (<em>CSS value for <a href='r.html#ruby-position@@@@property'><code>ruby-position</code></a> </em>) <a class='self-link' href='#under%40%40ruby-position%40value' aria-label="Permalink for under">§</a></span></dt>
<dd>Defined in <strong title='under is defined in CSS Ruby Annotation Layout 1'><a href=https://drafts.csswg.org/css-ruby-1/#valdef-ruby-position-under>CSS Ruby Annotation Layout 1</a></strong> </dd>
<dt id="under@@text-underline-position@value"><code class=prefix></code><span><strong><code class=css>under</code></strong> (<em>CSS value for <a href='t.html#text-underline-position@@@@property'><code>text-underline-position</code></a> </em>) <a class='self-link' href='#under%40%40text-underline-position%40value' aria-label="Permalink for under">§</a></span></dt>
<dd>Defined in <strong title='under is defined in CSS Text Decoration 3'><a href=https://drafts.csswg.org/css-text-decor-3/#underline-under>CSS Text Decoration 3</a></strong> , <strong title='under is defined in CSS Text Decoration 4'><a href=https://drafts.csswg.org/css-text-decor-4/#underline-under>CSS Text Decoration 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='under is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='under is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='under is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='under is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="under@@text-emphasis-position@value"><code class=prefix></code><span><strong><code class=css>under</code></strong> (<em>CSS value for <a href='t.html#text-emphasis-position@@@@property'><code>text-emphasis-position</code></a> </em>) <a class='self-link' href='#under%40%40text-emphasis-position%40value' aria-label="Permalink for under">§</a></span></dt>
<dd>Defined in <strong title='under is defined in CSS Text Decoration 3'><a href=https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-position-under>CSS Text Decoration 3</a></strong> , <strong title='under is defined in CSS Text Decoration 4'><a href=https://drafts.csswg.org/css-text-decor-4/#valdef-text-emphasis-position-under>CSS Text Decoration 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='under is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='under is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='under is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='under is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="under@@css-writing-modes%%dfn"><code class=prefix></code><span><strong>under</strong> (<em>concept</em>) <a class='self-link' href='#under%40%40css-writing-modes%25%25dfn' aria-label="Permalink for under">§</a></span></dt>
<dd>Defined in <strong title='under is defined in CSS Writing Modes 3'><a href=https://drafts.csswg.org/css-writing-modes-3/#under>CSS Writing Modes 3</a></strong> , <strong title='under is defined in CSS Writing Modes 4'><a href=https://drafts.csswg.org/css-writing-modes-4/#under>CSS Writing Modes 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='under is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='under is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='under is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='under is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a>,
<a href=https://drafts.csswg.org/css-inline-3/ title='under is referenced by CSS Inline Layout 3'>CSS Inline Layout 3</a>,
<a href=https://drafts.csswg.org/css-text-decor-3/ title='under is referenced by CSS Text Decoration 3'>CSS Text Decoration 3</a>,
<a href=https://drafts.csswg.org/css-text-decor-4/ title='under is referenced by CSS Text Decoration 4'>CSS Text Decoration 4</a></dd>
<dt id="underline@@text-decoration-line@value"><code class=prefix></code><span><strong><code class=css>underline</code></strong> (<em>CSS value for <a href='t.html#text-decoration-line@@@@property'><code>text-decoration-line</code></a> </em>) <a class='self-link' href='#underline%40%40text-decoration-line%40value' aria-label="Permalink for underline">§</a></span></dt>
<dd>Defined in <strong title='underline is defined in CSS Text Decoration 3'><a href=https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-underline>CSS Text Decoration 3</a></strong> , <strong title='underline is defined in CSS Text Decoration 4'><a href=https://drafts.csswg.org/css-text-decor-4/#valdef-text-decoration-line-underline>CSS Text Decoration 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='underline is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='underline is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='underline is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='underline is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a>,
<a href=https://drafts.csswg.org/css-syntax-3/ title='underline is referenced by CSS Syntax 3'>CSS Syntax 3</a></dd>
<dt id="underline@@text-decoration@value"><code class=prefix></code><span><strong><code class=css>underline</code></strong> (<em>CSS value for <a href='t.html#text-decoration@@@@property'><code>text-decoration</code></a> </em>) <a class='self-link' href='#underline%40%40text-decoration%40value' aria-label="Permalink for underline">§</a></span></dt>
<dd>Defined in <strong title='underline is defined in CSS 2'><a href=https://drafts.csswg.org/css2/#valdef-text-decoration-underline>CSS 2</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='underline is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='underline is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2025/ title='underline is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a>,
<a href=https://w3c.github.io/webvtt/ title='underline is referenced by WebVTT: The Web Video Text Tracks Format'>WebVTT: The Web Video Text Tracks Format</a></dd>
<dt id="UnderlineStyle@@@@enum"><code class=prefix></code><span><strong><code class=webidl>UnderlineStyle</code></strong> (<em>WebIDL enumeration</em>) <a class='self-link' href='#UnderlineStyle%40%40%40%40enum' aria-label="Permalink for UnderlineStyle">§</a></span></dt>
<dd>Defined in <strong title='UnderlineStyle is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-underlinestyle>EditContext API</a></strong> </dd>
<dd>Related terms: <em>value</em> <a href='d.html#dashed@@UnderlineStyle@enum-value'><code>dashed</code></a>, <em>value</em> <a href='d.html#dotted@@UnderlineStyle@enum-value'><code>dotted</code></a>, <em>value</em> <a href='n.html#none@@UnderlineStyle@enum-value'><code>none</code></a>, <em>value</em> <a href='s.html#solid@@UnderlineStyle@enum-value'><code>solid</code></a>, <em>value</em> <a href='w.html#wavy@@UnderlineStyle@enum-value'><code>wavy</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UnderlineStyle.html' title='UnderlineStyle entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="underlineStyle@@TextFormat@attribute"><code class=prefix><a href='t.html#TextFormat@@@@interface'>TextFormat</a>.</code><span><strong><code class=webidl>underlineStyle</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underlineStyle%40%40TextFormat%40attribute' aria-label="Permalink for <a href='t.html#TextFormat@@@@interface'>TextFormat</a>.underlineStyle">§</a></span></dt>
<dd>Defined in <strong title='underlineStyle is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-textformat-underlinestyle>EditContext API</a></strong> </dd>
<dt id="underlineStyle@@TextFormatInit@dict-member"><code class=prefix><a href='t.html#TextFormatInit@@@@dictionary'>TextFormatInit</a>.</code><span><strong><code class=webidl>underlineStyle</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#underlineStyle%40%40TextFormatInit%40dict-member' aria-label="Permalink for <a href='t.html#TextFormatInit@@@@dictionary'>TextFormatInit</a>.underlineStyle">§</a></span></dt>
<dd>Defined in <strong title='underlineStyle is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-textformatinit-underlinestyle>EditContext API</a></strong> </dd>
<dt id="UnderlineThickness@@@@enum"><code class=prefix></code><span><strong><code class=webidl>UnderlineThickness</code></strong> (<em>WebIDL enumeration</em>) <a class='self-link' href='#UnderlineThickness%40%40%40%40enum' aria-label="Permalink for UnderlineThickness">§</a></span></dt>
<dd>Defined in <strong title='UnderlineThickness is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-underlinethickness>EditContext API</a></strong> </dd>
<dd>Related terms: <em>value</em> <a href='n.html#none@@UnderlineThickness@enum-value'><code>none</code></a>, <em>value</em> <a href='t.html#thick@@UnderlineThickness@enum-value'><code>thick</code></a>, <em>value</em> <a href='t.html#thin@@UnderlineThickness@enum-value'><code>thin</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UnderlineThickness.html' title='UnderlineThickness entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="underlineThickness@@TextFormat@attribute"><code class=prefix><a href='t.html#TextFormat@@@@interface'>TextFormat</a>.</code><span><strong><code class=webidl>underlineThickness</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underlineThickness%40%40TextFormat%40attribute' aria-label="Permalink for <a href='t.html#TextFormat@@@@interface'>TextFormat</a>.underlineThickness">§</a></span></dt>
<dd>Defined in <strong title='underlineThickness is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-textformat-underlinethickness>EditContext API</a></strong> </dd>
<dt id="underlineThickness@@TextFormatInit@dict-member"><code class=prefix><a href='t.html#TextFormatInit@@@@dictionary'>TextFormatInit</a>.</code><span><strong><code class=webidl>underlineThickness</code></strong> (<em>WebIDL dictionary member</em>) <a class='self-link' href='#underlineThickness%40%40TextFormatInit%40dict-member' aria-label="Permalink for <a href='t.html#TextFormatInit@@@@dictionary'>TextFormatInit</a>.underlineThickness">§</a></span></dt>
<dd>Defined in <strong title='underlineThickness is defined in EditContext API'><a href=https://w3c.github.io/edit-context/#dom-textformatinit-underlinethickness>EditContext API</a></strong> </dd>
<dt id="underlying buffer@@BufferSource@dfn"><code class=prefix></code><span><strong>underlying buffer</strong> (<em>concept for <a href='b.html#BufferSource@@@@typedef'><code>BufferSource</code></a> </em>) <a class='self-link' href='#underlying%20buffer%40%40BufferSource%40dfn' aria-label="Permalink for underlying buffer">§</a></span></dt>
<dd>Defined in <strong title='underlying buffer is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#buffersource-underlying-buffer>Web IDL</a></strong> </dd>
<dd>Referenced in
<a href=https://fs.spec.whatwg.org/ title='underlying buffer is referenced by File System'>File System</a>,
<a href=https://streams.spec.whatwg.org/ title='underlying buffer is referenced by Streams'>Streams</a>,
<a href=https://w3c.github.io/webtransport/ title='underlying buffer is referenced by WebTransport'>WebTransport</a></dd>
<dt id="UnderlyingSink@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSink</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UnderlyingSink%40%40%40%40dictionary' aria-label="Permalink for UnderlyingSink">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSink is defined in Streams'><a href=https://streams.spec.whatwg.org/#dictdef-underlyingsink>Streams</a></strong> </dd>
<dd>Related terms: <code>UnderlyingSink.</code><a href='a.html#abort@@UnderlyingSink@dict-member'><code>abort</code></a>, <code>UnderlyingSink.</code><a href='c.html#close@@UnderlyingSink@dict-member'><code>close</code></a>, <code>UnderlyingSink.</code><a href='s.html#start@@UnderlyingSink@dict-member'><code>start</code></a>, <code>UnderlyingSink.</code><a href='t.html#type@@UnderlyingSink@dict-member'><code>type</code></a>, <code>UnderlyingSink.</code><a href='w.html#write@@UnderlyingSink@dict-member'><code>write</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UnderlyingSink.html' title='UnderlyingSink entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UnderlyingSinkAbortCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSinkAbortCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSinkAbortCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSinkAbortCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSinkAbortCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsinkabortcallback>Streams</a></strong> </dd>
<dt id="UnderlyingSinkCloseCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSinkCloseCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSinkCloseCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSinkCloseCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSinkCloseCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsinkclosecallback>Streams</a></strong> </dd>
<dt id="UnderlyingSinkStartCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSinkStartCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSinkStartCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSinkStartCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSinkStartCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsinkstartcallback>Streams</a></strong> </dd>
<dt id="UnderlyingSinkWriteCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSinkWriteCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSinkWriteCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSinkWriteCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSinkWriteCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsinkwritecallback>Streams</a></strong> </dd>
<dt id="UnderlyingSource@@@@dictionary"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSource</code></strong> (<em>WebIDL dictionary</em>) <a class='self-link' href='#UnderlyingSource%40%40%40%40dictionary' aria-label="Permalink for UnderlyingSource">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSource is defined in Streams'><a href=https://streams.spec.whatwg.org/#dictdef-underlyingsource>Streams</a></strong> </dd>
<dd>Related terms: <code>UnderlyingSource.</code><a href='a.html#autoAllocateChunkSize@@UnderlyingSource@dict-member'><code>autoAllocateChunkSize</code></a>, <code>UnderlyingSource.</code><a href='c.html#cancel@@UnderlyingSource@dict-member'><code>cancel</code></a>, <code>UnderlyingSource.</code><a href='p.html#pull@@UnderlyingSource@dict-member'><code>pull</code></a>, <code>UnderlyingSource.</code><a href='s.html#start@@UnderlyingSource@dict-member'><code>start</code></a>, <code>UnderlyingSource.</code><a href='t.html#type@@UnderlyingSource@dict-member'><code>type</code></a></dd>
<dd>see also <a href='https://dontcallmedom.github.io/webidlpedia/names/UnderlyingSource.html' title='UnderlyingSource entry on WebIDLpedia'>WebIDLPedia</a></dd><dt id="UnderlyingSourceCancelCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSourceCancelCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSourceCancelCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSourceCancelCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSourceCancelCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsourcecancelcallback>Streams</a></strong> </dd>
<dt id="UnderlyingSourcePullCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSourcePullCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSourcePullCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSourcePullCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSourcePullCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsourcepullcallback>Streams</a></strong> </dd>
<dt id="UnderlyingSourceStartCallback@@@@callback"><code class=prefix></code><span><strong><code class=webidl>UnderlyingSourceStartCallback</code></strong> (<em>WebIDL callback</em>) <a class='self-link' href='#UnderlyingSourceStartCallback%40%40%40%40callback' aria-label="Permalink for UnderlyingSourceStartCallback">§</a></span></dt>
<dd>Defined in <strong title='UnderlyingSourceStartCallback is defined in Streams'><a href=https://streams.spec.whatwg.org/#callbackdef-underlyingsourcestartcallback>Streams</a></strong> </dd>
<dt id="[[underrun duration]]@@AudioPlaybackStats@attribute"><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>[[underrun duration]]</code></strong> (<em>internal slot</em>) <a class='self-link' href='#%5B%5Bunderrun%20duration%5D%5D%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.[[underrun duration]]">§</a></span></dt>
<dt><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>[[underrun duration]]</code></strong> (<em>internal slot</em>) <a class='self-link' href='#%5B%5Bunderrun%20duration%5D%5D%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.[[underrun duration]]">§</a></span></dt>
<dd>Defined in <strong title='[[underrun duration]] is defined in Web Audio API'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrun-duration-slot>Web Audio API</a></strong> , <strong title='[[underrun duration]] is defined in Web Audio API 1.1'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrun-duration-slot>Web Audio API 1.1</a></strong> </dd>
<dt id="[[underrun events]]@@AudioPlaybackStats@attribute"><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>[[underrun events]]</code></strong> (<em>internal slot</em>) <a class='self-link' href='#%5B%5Bunderrun%20events%5D%5D%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.[[underrun events]]">§</a></span></dt>
<dt><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>[[underrun events]]</code></strong> (<em>internal slot</em>) <a class='self-link' href='#%5B%5Bunderrun%20events%5D%5D%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.[[underrun events]]">§</a></span></dt>
<dd>Defined in <strong title='[[underrun events]] is defined in Web Audio API'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrun-events-slot>Web Audio API</a></strong> , <strong title='[[underrun events]] is defined in Web Audio API 1.1'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrun-events-slot>Web Audio API 1.1</a></strong> </dd>
<dt id="underrunDuration@@AudioPlaybackStats@attribute"><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>underrunDuration</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underrunDuration%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.underrunDuration">§</a></span></dt>
<dt><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>underrunDuration</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underrunDuration%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.underrunDuration">§</a></span></dt>
<dd>Defined in <strong title='underrunDuration is defined in Web Audio API'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrunduration>Web Audio API</a></strong> , <strong title='underrunDuration is defined in Web Audio API 1.1'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrunduration>Web Audio API 1.1</a></strong> </dd>
<dt id="underrunEvents@@AudioPlaybackStats@attribute"><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>underrunEvents</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underrunEvents%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.underrunEvents">§</a></span></dt>
<dt><code class=prefix><a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.</code><span><strong><code class=webidl>underrunEvents</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#underrunEvents%40%40AudioPlaybackStats%40attribute' aria-label="Permalink for <a href='a.html#AudioPlaybackStats@@@@interface'>AudioPlaybackStats</a>.underrunEvents">§</a></span></dt>
<dd>Defined in <strong title='underrunEvents is defined in Web Audio API'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrunevents>Web Audio API</a></strong> , <strong title='underrunEvents is defined in Web Audio API 1.1'><a href=https://webaudio.github.io/web-audio-api/#dom-audioplaybackstats-underrunevents>Web Audio API 1.1</a></strong> </dd>
<dt id="underscore@@caret-shape@value"><code class=prefix></code><span><strong><code class=css>underscore</code></strong> (<em>CSS value for <a href='c.html#caret-shape@@@@property'><code>caret-shape</code></a> </em>) <a class='self-link' href='#underscore%40%40caret-shape%40value' aria-label="Permalink for underscore">§</a></span></dt>
<dd>Defined in <strong title='underscore is defined in CSS User Interface 4'><a href=https://drafts.csswg.org/css-ui-4/#valdef-caret-shape-underscore>CSS User Interface 4</a></strong> </dd>
<dt id="underspecified storage partition@@errors@dfn"><code class=prefix></code><span><strong>underspecified storage partition</strong> (<em>concept for <a href='e.html#[[errors]]@@GPU error scope@attribute'><code>[[errors]]</code></a> </em>) <a class='self-link' href='#underspecified%20storage%20partition%40%40errors%40dfn' aria-label="Permalink for underspecified storage partition">§</a></span></dt>
<dd>Defined in <strong title='underspecified storage partition is defined in WebDriver BiDi'><a href=https://w3c.github.io/webdriver-bidi/#errors-underspecified-storage-partition>WebDriver BiDi</a></strong> </dd>
<dt id="unescape(string)@@globalThis@method"><code class=prefix><a href='g.html#globalThis@@globalThis@attribute'>globalThis</a>.</code><span><strong><code class=webidl>unescape(string)</code></strong> (<em>WebIDL operation</em>) <a class='self-link' href='#unescape(string)%40%40globalThis%40method' aria-label="Permalink for <a href='g.html#globalThis@@globalThis@attribute'>globalThis</a>.unescape(string)">§</a></span></dt>
<dd>Defined in <strong title='unescape(string) is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/additional-ecmascript-features-for-web-browsers.html#sec-unescape-string>ECMAScript</a></strong> </dd>
<dt id="unfilterable-float@@GPUTextureSampleType@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unfilterable-float"</code></strong> (<em>value for <a href='g.html#GPUTextureSampleType@@@@enum'><code>GPUTextureSampleType</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unfilterable-float%40%40GPUTextureSampleType%40enum-value' aria-label="Permalink for unfilterable-float">§</a></span></dt>
<dd>Defined in <strong title='unfilterable-float is defined in WebGPU'><a href=https://gpuweb.github.io/gpuweb/#dom-gputexturesampletype-unfilterable-float>WebGPU</a></strong> </dd>
<dd>Referenced in
<a href=https://gpuweb.github.io/gpuweb/wgsl/ title='unfilterable-float is referenced by WebGPU Shading Language'>WebGPU Shading Language</a></dd>
<dt id="unforced break@@css-break%%dfn"><code class=prefix></code><span><strong>unforced break</strong> (<em>concept</em>) <a class='self-link' href='#unforced%20break%40%40css-break%25%25dfn' aria-label="Permalink for unforced break">§</a></span></dt>
<dd>Defined in <strong title='unforced break is defined in CSS Fragmentation 3'><a href=https://drafts.csswg.org/css-break-3/#unforced-break>CSS Fragmentation 3</a></strong> , <strong title='unforced break is defined in CSS Fragmentation 4'><a href=https://drafts.csswg.org/css-break-4/#unforced-break>CSS Fragmentation 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2022/ title='unforced break is referenced by CSS Snapshot 2022'>CSS Snapshot 2022</a>,
<a href=https://drafts.csswg.org/css-2023/ title='unforced break is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='unforced break is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='unforced break is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a>,
<a href=https://drafts.csswg.org/css-overflow-4/ title='unforced break is referenced by CSS Overflow 4'>CSS Overflow 4</a></dd>
<dt id="unforgeable@@webidl%%dfn"><code class=prefix></code><span><strong>unforgeable</strong> (<em>concept</em>) <a class='self-link' href='#unforgeable%40%40webidl%25%25dfn' aria-label="Permalink for unforgeable">§</a></span></dt>
<dd>Defined in <strong title='unforgeable is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#dfn-unforgeable-on-an-interface>Web IDL</a></strong> </dd>
<dt id="unforgeable property name@@webidl%%dfn"><code class=prefix></code><span><strong>unforgeable property name</strong> (<em>concept</em>) <a class='self-link' href='#unforgeable%20property%20name%40%40webidl%25%25dfn' aria-label="Permalink for unforgeable property name">§</a></span></dt>
<dd>Defined in <strong title='unforgeable property name is defined in Web IDL'><a href=https://webidl.spec.whatwg.org/#dfn-unforgeable-property-name>Web IDL</a></strong> </dd>
<dt id="unframed@@display mode@dfn"><code class=prefix></code><span><strong>unframed</strong> (<em>concept for <a href='d.html#display mode@@appmanifest%25%25dfn'>display mode</a> </em>) <a class='self-link' href='#unframed%40%40display%20mode%40dfn' aria-label="Permalink for unframed">§</a></span></dt>
<dd>Defined in <strong title='unframed is defined in Manifest Incubations'><a href=https://wicg.github.io/manifest-incubations/#dfn-unframed>Manifest Incubations</a></strong> </dd>
<dt id="unfrozen@@page-lifecycle%%dfn"><code class=prefix></code><span><strong>unfrozen</strong> (<em>concept</em>) <a class='self-link' href='#unfrozen%40%40page-lifecycle%25%25dfn' aria-label="Permalink for unfrozen">§</a></span></dt>
<dd>Defined in <strong title='unfrozen is defined in Page Lifecycle'><a href=https://wicg.github.io/page-lifecycle/#unfrozen>Page Lifecycle</a></strong> </dd>
<dt id="unhandledrejection@@Window@event"><code class=prefix></code><span><strong><code class=webidl>unhandledrejection</code></strong> (<em>event for <a href='w.html#Window@@@@interface'><code>Window</code></a>, <a href='w.html#WorkerGlobalScope@@@@interface'><code>WorkerGlobalScope</code></a> interface </em>) <a class='self-link' href='#unhandledrejection%40%40Window%40event' aria-label="Permalink for unhandledrejection">§</a></span></dt>
<dd>Defined in <strong title='unhandledrejection is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/indices.html#event-unhandledrejection>HTML</a></strong> </dd>
<dd>Referenced in
<a href=https://streams.spec.whatwg.org/ title='unhandledrejection is referenced by Streams'>Streams</a>,
<a href=https://webidl.spec.whatwg.org/ title='unhandledrejection is referenced by Web IDL'>Web IDL</a>,
<a href=https://drafts.csswg.org/css-view-transitions-1/ title='unhandledrejection is referenced by CSS View Transitions 1'>CSS View Transitions 1</a>,
<a href=https://drafts.csswg.org/css-view-transitions-2/ title='unhandledrejection is referenced by CSS View Transitions 2'>CSS View Transitions 2</a></dd>
<dt id="Unicameral@@i18n-glossary%%dfn"><code class=prefix></code><span><strong>Unicameral</strong> (<em>concept</em>) <a class='self-link' href='#Unicameral%40%40i18n-glossary%25%25dfn' aria-label="Permalink for Unicameral">§</a></span></dt>
<dd>Defined in <strong title='Unicameral is defined in Internationalization Glossary'><a href=https://w3c.github.io/i18n-glossary/#dfn-unicameral>Internationalization Glossary</a></strong> </dd>
<dt id="unicase@@CanvasFontVariantCaps@enum-value"><code class=prefix></code><span><strong><code class=webidl>"unicase"</code></strong> (<em>value for <a href='c.html#CanvasFontVariantCaps@@@@enum'><code>CanvasFontVariantCaps</code></a> WebIDL enumeration</em>) <a class='self-link' href='#unicase%40%40CanvasFontVariantCaps%40enum-value' aria-label="Permalink for unicase">§</a></span></dt>
<dd>Defined in <strong title='unicase is defined in HTML'><a href=https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-fontvariantcaps-unicase>HTML</a></strong> </dd>
<dt id="unicase@@font-variant-caps@value"><code class=prefix></code><span><strong><code class=css>unicase</code></strong> (<em>CSS value for <a href='f.html#font-variant-caps@@@@property'><code>font-variant-caps</code></a> </em>) <a class='self-link' href='#unicase%40%40font-variant-caps%40value' aria-label="Permalink for unicase">§</a></span></dt>
<dd>Defined in <strong title='unicase is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-variant-caps-unicase>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='unicase is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='unicase is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='unicase is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="unicode@@font-variant-emoji@value"><code class=prefix></code><span><strong><code class=css>unicode</code></strong> (<em>CSS value for <a href='f.html#font-variant-emoji@@@@property'><code>font-variant-emoji</code></a> </em>) <a class='self-link' href='#unicode%40%40font-variant-emoji%40value' aria-label="Permalink for unicode">§</a></span></dt>
<dd>Defined in <strong title='unicode is defined in CSS Fonts 4'><a href=https://drafts.csswg.org/css-fonts-4/#valdef-font-variant-emoji-unicode>CSS Fonts 4</a></strong> </dd>
<dd>Referenced in
<a href=https://drafts.csswg.org/css-2023/ title='unicode is referenced by CSS Snapshot 2023'>CSS Snapshot 2023</a>,
<a href=https://drafts.csswg.org/css-2024/ title='unicode is referenced by CSS Snapshot 2024'>CSS Snapshot 2024</a>,
<a href=https://drafts.csswg.org/css-2025/ title='unicode is referenced by CSS Snapshot 2025'>CSS Snapshot 2025</a></dd>
<dt id="unicode@@i18n-glossary%%dfn"><code class=prefix></code><span><strong>unicode</strong> (<em>concept</em>) <a class='self-link' href='#unicode%40%40i18n-glossary%25%25dfn' aria-label="Permalink for unicode">§</a></span></dt>
<dd>Defined in <strong title='unicode is defined in Internationalization Glossary'><a href=https://w3c.github.io/i18n-glossary/#dfn-unicode>Internationalization Glossary</a></strong> </dd>
<dd>Referenced in
<a href=https://wicg.github.io/shared-storage/ title='unicode is referenced by Shared Storage API'>Shared Storage API</a></dd>
<dt id="unicode@@RegExp@attribute"><code class=prefix><a href='r.html#RegExp@@@@interface'>RegExp</a>.</code><span><strong><code class=webidl>unicode</code></strong> (<em>WebIDL attribute</em>) <a class='self-link' href='#unicode%40%40RegExp%40attribute' aria-label="Permalink for <a href='r.html#RegExp@@@@interface'>RegExp</a>.unicode">§</a></span></dt>
<dd>Defined in <strong title='unicode is defined in ECMAScript'><a href=https://tc39.es/ecma262/multipage/text-processing.html#sec-get-regexp.prototype.unicode>ECMAScript</a></strong> </dd>
<dt id="unicode bidi algorithm@@i18n-glossary%%dfn"><code class=prefix></code><span><strong>unicode bidi algorithm</strong> (<em>concept</em>) <a class='self-link' href='#unicode%20bidi%20algorithm%40%40i18n-glossary%25%25dfn' aria-label="Permalink for unicode bidi algorithm">§</a></span></dt>
<dd>Defined in <strong title='unicode bidi algorithm is defined in Internationalization Glossary'><a href=https://w3c.github.io/i18n-glossary/#dfn-unicode-bidi-algorithm>Internationalization Glossary</a></strong> </dd>
<dt id="Unicode code point@@i18n-glossary%%dfn"><code class=prefix></code><span><strong>Unicode code point</strong> (<em>concept</em>) <a class='self-link' href='#Unicode%20code%20point%40%40i18n-glossary%25%25dfn' aria-label="Permalink for Unicode code point">§</a></span></dt>
<dd>Defined in <strong title='Unicode code point is defined in Internationalization Glossary'><a href=https://w3c.github.io/i18n-glossary/#dfn-unicode-code-point>Internationalization Glossary</a></strong> </dd>
<dd>Referenced in