From b187012b43e332b3bac54f5b5f94bb4368ca0e1b Mon Sep 17 00:00:00 2001
From: Rik Cabanier <cabanier@meta.com>
Date: Thu, 8 Feb 2024 21:24:23 +0000
Subject: [PATCH] Merge pull request #1343 from AdaRoseCannon/transient-input

SHA: 47d14b602dd23e5403b3ab3aa323b1bb3cd26a24
Reason: push, by cabanier

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 104 +++++++++++++++++++++++++++++------------------------
 1 file changed, 58 insertions(+), 46 deletions(-)

diff --git a/index.html b/index.html
index 5a3fcddf..5fbfa453 100644
--- a/index.html
+++ b/index.html
@@ -5,9 +5,9 @@
   <title>WebXR Device API</title>
   <meta content="CR" name="w3c-status">
   <link href="https://www.w3.org/StyleSheets/TR/2021/W3C-CR" rel="stylesheet">
-  <meta content="Bikeshed version 6edc88947, updated Thu Aug 17 11:18:09 2023 -0700" name="generator">
+  <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://www.w3.org/TR/webxr/" rel="canonical">
-  <meta content="9a0cb83e6098e42837c0d551d8b78a6c4459d2c4" name="document-revision">
+  <meta content="47d14b602dd23e5403b3ab3aa323b1bb3cd26a24" name="document-revision">
   <link href="favicon-32x32.png" rel="icon" sizes="32x32" type="image/png">
   <link href="favicon-96x96.png" rel="icon" sizes="96x96" type="image/png">
 <style>
@@ -980,7 +980,7 @@ <h1 class="p-name no-ref" id="title">WebXR Device API</h1>
     </div>
    </details>
    <div data-fill-with="warning"></div>
-   <p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2022 <a href="https://www.w3.org/">World Wide Web Consortium</a>. <abbr title="World Wide Web Consortium">W3C</abbr><sup>®</sup> <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/copyright-software" rel="license" title="W3C Software and Document License">permissive document license</a> rules apply. </p>
+   <p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/policies/#copyright">Copyright</a> © 2022 <a href="https://www.w3.org/">World Wide Web Consortium</a>. <abbr title="World Wide Web Consortium">W3C</abbr><sup>®</sup> <a href="https://www.w3.org/policies/#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/policies/#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/copyright/software-license/" rel="license" title="W3C Software and Document License">permissive document license</a> rules apply. </p>
    <hr title="Separator for header">
   </div>
   <div class="p-summary" data-fill-with="abstract">
@@ -993,11 +993,11 @@ <h2 class="no-num no-toc no-ref heading settled" id="sotd"><span class="content"
    <p> The Immersive Web Working Group maintains <a href="https://github.com/immersive-web/webxr/issues">a list of all bug
         reports that the group has not yet addressed</a>. This draft highlights some of the pending issues that are still to be discussed in the working group. No decision has been taken on the outcome of these issues including whether they are valid.
             Pull requests with proposed specification text for outstanding issues are strongly encouraged. </p>
-   <p> This document was published by the <a href="https://www.w3.org/groups/wg/immersive-web">Immersive Web Working Group</a> as a Candidate Recommendation Snapshot using the <a href="https://www.w3.org/2023/Process-20230612/#recs-and-notes">Recommendation
+   <p> This document was published by the <a href="https://www.w3.org/groups/wg/immersive-web">Immersive Web Working Group</a> as a Candidate Recommendation Snapshot using the <a href="https://www.w3.org/2023/Process-20231103/#recs-and-notes">Recommendation
       track</a>. This document is intended to become a <abbr title="World Wide Web Consortium">W3C</abbr> Recommendation.
       This document will remain a Candidate Recommendation at least until <time class="status-deadline" datetime="2022-04-28">28 April 2022</time> in order to ensure the opportunity for wide review. </p>
    <p> Publication as a Candidate Recommendation does not imply endorsement by <abbr title="World Wide Web Consortium">W3C</abbr> and its Members. 
-               A Candidate Recommendation Snapshot has received <a href="https://www.w3.org/2023/Process-20230612/#dfn-wide-review">wide review</a>, is intended to
+               A Candidate Recommendation Snapshot has received <a href="https://www.w3.org/2023/Process-20231103/#dfn-wide-review">wide review</a>, is intended to
           gather implementation experience, and has commitments from Working Group members to <a href="https://www.w3.org/Consortium/Patent-Policy/#sec-Requirements">royalty-free licensing</a> for implementations. </p>
    <p> The entrance criteria for this document to enter the Proposed Recommendation stage
   is to have a minimum of two independent and interoperable user agents that
@@ -1009,7 +1009,7 @@ <h2 class="no-num no-toc no-ref heading settled" id="sotd"><span class="content"
             disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="https://www.w3.org/Consortium/Patent-Policy/#def-essential">Essential
             Claim(s)</a> must disclose the information in accordance with <a href="https://www.w3.org/Consortium/Patent-Policy/#sec-Disclosure">section
             6 of the W3C Patent Policy</a>. </p>
-   <p> This document is governed by the <a href="https://www.w3.org/2023/Process-20230612/" id="w3c_process_revision">12 June 2023 W3C Process Document</a>. </p>
+   <p> This document is governed by the <a href="https://www.w3.org/2023/Process-20231103/" id="w3c_process_revision">03 November 2023 W3C Process Document</a>. </p>
    <p> For changes since the last draft,
         see the <a href="#changes">Changes</a> section. </p>
    <p></p>
@@ -2805,7 +2805,8 @@ <h3 class="heading settled" data-level="10.1" id="xrinputsource-interface"><span
 <c- b>enum</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-xrtargetraymode"><code><c- g>XRTargetRayMode</c-></code></dfn> {
   <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-gaze" id="ref-for-dom-xrtargetraymode-gaze"><c- s>"gaze"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-tracked-pointer" id="ref-for-dom-xrtargetraymode-tracked-pointer"><c- s>"tracked-pointer"</c-></a>,
-  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen"><c- s>"screen"</c-></a>
+  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen"><c- s>"screen"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-transient-pointer" id="ref-for-dom-xrtargetraymode-transient-pointer"><c- s>"transient-pointer"</c-></a>
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext①③"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①②"><c- g>Exposed</c-></a>=<c- n>Window</c->]
@@ -2827,10 +2828,14 @@ <h3 class="heading settled" data-level="10.1" id="xrinputsource-interface"><span
      <p><dfn class="dfn-paneled idl-code" data-dfn-for="XRTargetRayMode" data-dfn-type="enum-value" data-export data-lt="&quot;tracked-pointer&quot;|tracked-pointer" id="dom-xrtargetraymode-tracked-pointer"><code>tracked-pointer</code></dfn> indicates that the target ray originates from either a handheld device or other hand-tracking mechanism and represents that the user is using their hands or the held device for pointing. The orientation of the target ray relative to the tracked object MUST follow platform-specific ergonomics guidelines when available. In the absence of platform-specific guidance, the target ray SHOULD point in the same direction as the user’s index finger if it was outstretched.</p>
     <li data-md>
      <p><dfn class="dfn-paneled idl-code" data-dfn-for="XRTargetRayMode" data-dfn-type="enum-value" data-export data-lt="&quot;screen&quot;|screen" id="dom-xrtargetraymode-screen"><code>screen</code></dfn> indicates that the input source was an interaction with the canvas element associated with an inline session’s output context, such as a mouse click or touch event.</p>
+    <li data-md>
+     <p><dfn class="dfn-paneled idl-code" data-dfn-for="XRTargetRayMode" data-dfn-type="enum-value" data-export data-lt="&quot;transient-pointer&quot;|transient-pointer" id="dom-xrtargetraymode-transient-pointer"><code>transient-pointer</code></dfn> indicates that the input source was generated as part of an operating system interaction intent rather than a specific piece of hardware. Some examples are user intents based on information too sensitive to expose directly such as gaze, synthesised inputs from web driver or inputs generated by assistive technologies. This should only be used for assistive technologies if it is also used as a primary input so as to not inadvertently indicate that assistive technology is being used as per the W3C design principals.</p>
    </ul>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSource" data-dfn-type="attribute" data-export id="dom-xrinputsource-targetrayspace"><code>targetRaySpace</code></dfn> attribute is an <code class="idl"><a data-link-type="idl" href="#xrspace" id="ref-for-xrspace②④">XRSpace</a></code> that has a <a data-link-type="dfn" href="#xrspace-native-origin" id="ref-for-xrspace-native-origin①④">native origin</a> tracking the position and orientation of the preferred pointing ray of the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⓪">XRInputSource</a></code> (along its <code>-Z</code> axis), as defined by the <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode②">targetRayMode</a></code>.</p>
+   <p>For input sources with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode③">targetRayMode</a></code> of <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-transient-pointer" id="ref-for-dom-xrtargetraymode-transient-pointer①">"transient-pointer"</a></code> the <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetrayspace" id="ref-for-dom-xrinputsource-targetrayspace③">targetRaySpace</a></code> represents the ray to the interaction target at the start of the interaction. The pose for this should be static within the gripSpace for this XRInput.</p>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSource" data-dfn-type="attribute" data-export id="dom-xrinputsource-gripspace"><code>gripSpace</code></dfn> attribute is an <code class="idl"><a data-link-type="idl" href="#xrspace" id="ref-for-xrspace②⑤">XRSpace</a></code> that has a <a data-link-type="dfn" href="#xrspace-native-origin" id="ref-for-xrspace-native-origin①⑤">native origin</a> tracking to the pose that should be used to render virtual objects such that they appear to be held in the user’s hand. If the user were to hold a straight rod, this <code class="idl"><a data-link-type="idl" href="#xrspace" id="ref-for-xrspace②⑥">XRSpace</a></code> places the <a data-link-type="dfn" href="#xrspace-native-origin" id="ref-for-xrspace-native-origin①⑥">native origin</a> at the centroid of their curled fingers and where the <code>-Z</code> axis points along the length of the rod towards their thumb. The <code>X</code> axis is perpendicular to the back of the hand being described, with the back of the user’s right hand pointing towards <code>+X</code> and the back of the user’s left hand pointing towards <code>-X</code>. The <code>Y</code> axis is implied by the relationship between the <code>X</code> and <code>Z</code> axis, with <code>+Y</code> roughly pointing in the direction of the user’s arm.</p>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-gripspace" id="ref-for-dom-xrinputsource-gripspace④">gripSpace</a></code> MUST be <code>null</code> if the input source isn’t inherently trackable such as for input sources with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode③">targetRayMode</a></code> of <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-gaze" id="ref-for-dom-xrtargetraymode-gaze①">"gaze"</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen①">"screen"</a></code>.</p>
+   <p>For input sources with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode④">targetRayMode</a></code> of <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-transient-pointer" id="ref-for-dom-xrtargetraymode-transient-pointer②">"transient-pointer"</a></code> the <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-gripspace" id="ref-for-dom-xrinputsource-gripspace④">gripSpace</a></code> should be the associated user gesture if there is one, otherwise it should be another space the user controls such as the ViewerSpace or the gripSpace or the targetRaySpace of another XRInput. This is to allow user the user to still manipulate the targetRaySpace.</p>
+   <p>The <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-gripspace" id="ref-for-dom-xrinputsource-gripspace⑤">gripSpace</a></code> MUST be <code>null</code> if the input source isn’t inherently trackable such as for input sources with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode⑤">targetRayMode</a></code> of <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-gaze" id="ref-for-dom-xrtargetraymode-gaze①">"gaze"</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen①">"screen"</a></code>.</p>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSource" data-dfn-type="attribute" data-export id="dom-xrinputsource-profiles"><code>profiles</code></dfn> attribute is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①⑥">list</a> of <a data-link-type="dfn" href="#xrinputsource-input-profile-name" id="ref-for-xrinputsource-input-profile-name">input profile name</a>s indicating both the prefered visual representation and behavior of the input source.</p>
    <p>An <dfn class="dfn-paneled" data-dfn-for="XRInputSource" data-dfn-type="dfn" data-noexport id="xrinputsource-input-profile-name">input profile name</dfn> is an ASCII lowercase <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥">DOMString</a></code> containing no spaces, with separate words concatenated with a hyphen (<code>-</code>) character. A descriptive name should be chosen, using the prefered verbiage of the device vendor when possible. If the platform provides an appropriate identifier, such as a USB vendor and product ID, it MAY be used. Values that uniquely identify a single device, such as serial numbers, MUST NOT be used. The <a data-link-type="dfn" href="#xrinputsource-input-profile-name" id="ref-for-xrinputsource-input-profile-name①">input profile name</a> MUST NOT contain an indication of device handedness. If multiple user agents expose the same device, they SHOULD make an effort to report the same <a data-link-type="dfn" href="#xrinputsource-input-profile-name" id="ref-for-xrinputsource-input-profile-name②">input profile name</a>. The <a href="https://github.com/immersive-web/webxr-input-profiles/tree/master/packages/registry">WebXR Input Profiles Registry</a> is the recommended location for managing <a data-link-type="dfn" href="#xrinputsource-input-profile-name" id="ref-for-xrinputsource-input-profile-name③">input profile name</a>s.</p>
    <p>Profiles are given in descending order of specificity. Any <a data-link-type="dfn" href="#xrinputsource-input-profile-name" id="ref-for-xrinputsource-input-profile-name④">input profile name</a>s given after the first entry in the list should provide fallback values that represent alternative representations of the device. This may include a more generic or prior version of the device, a more widely recognized device that is sufficiently similar, or a broad description of the device type (such as "generic-trigger-touchpad"). If multiple profiles are given, the layouts they describe must all represent a superset or subset of every other profile in the list.</p>
@@ -2909,8 +2914,11 @@ <h3 class="heading settled" data-level="10.1" id="xrinputsource-interface"><span
     </ol>
    </div>
    <h3 class="heading settled" data-level="10.2" id="transient-input"><span class="secno">10.2. </span><span class="content">Transient input</span><a class="self-link" href="#transient-input"></a></h3>
-   <p>Some <a data-link-type="dfn" href="#xr-device" id="ref-for-xr-device①④">XR device</a>s may support <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="transient-input-sources">transient input sources</dfn>, where the <a data-link-type="dfn" href="#xr-input-source" id="ref-for-xr-input-source②④">XR input source</a> is only meaningful while performing a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="transient-action">transient action</dfn>, either the <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action⑨">primary action</a> for a <a data-link-type="dfn" href="#primary-input-source" id="ref-for-primary-input-source①">primary input source</a>, or a device-specific <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="auxiliary-action">auxiliary action</dfn> for an <a data-link-type="dfn" href="#auxiliary-input-source" id="ref-for-auxiliary-input-source">auxiliary input source</a>. An example would be mouse, touch, or stylus input against an <code class="idl"><a data-link-type="idl" href="#dom-xrsessionmode-inline" id="ref-for-dom-xrsessionmode-inline①⑨">"inline"</a></code> <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①①②">XRSession</a></code>, which MUST produce a transient <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①③">XRInputSource</a></code> with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode④">targetRayMode</a></code> set to <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen②">screen</a></code>, treated as a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⓪">primary action</a> for the <a data-link-type="dfn" href="https://www.w3.org/TR/pointerevents/#dfn-primary-pointer" id="ref-for-dfn-primary-pointer">primary pointer</a>, and as a non-primary <a data-link-type="dfn" href="#auxiliary-action" id="ref-for-auxiliary-action">auxiliary action</a> for a non-primary pointer. <a data-link-type="dfn" href="#transient-input-sources" id="ref-for-transient-input-sources①">Transient input sources</a> are only present in the session’s <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources⑧">list of active XR input sources</a> for the duration of the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action">transient action</a>.</p>
-   <p><a data-link-type="dfn" href="#transient-input-sources" id="ref-for-transient-input-sources②">Transient input sources</a> follow the following sequence when handling <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action①">transient actions</a> instead of the algorithms for non-transient <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①①">primary actions</a>:</p>
+   <p>Some <a data-link-type="dfn" href="#xr-device" id="ref-for-xr-device①④">XR device</a>s may support <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="transient-input-sources">transient input sources</dfn>, where the <a data-link-type="dfn" href="#xr-input-source" id="ref-for-xr-input-source②④">XR input source</a> is only meaningful while performing a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="transient-action">transient action</dfn>, either the <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action⑨">primary action</a> for a <a data-link-type="dfn" href="#primary-input-source" id="ref-for-primary-input-source①">primary input source</a>, or a device-specific <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="auxiliary-action">auxiliary action</dfn> for an <a data-link-type="dfn" href="#auxiliary-input-source" id="ref-for-auxiliary-input-source">auxiliary input source</a>.</p>
+   <p>One example would be mouse, touch, or stylus input against an <code class="idl"><a data-link-type="idl" href="#dom-xrsessionmode-inline" id="ref-for-dom-xrsessionmode-inline①⑨">"inline"</a></code> <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①①②">XRSession</a></code>, which MUST produce a transient <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①③">XRInputSource</a></code> with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode⑥">targetRayMode</a></code> set to <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-screen" id="ref-for-dom-xrtargetraymode-screen②">screen</a></code>, treated as a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⓪">primary action</a> for the <a data-link-type="dfn" href="https://www.w3.org/TR/pointerevents/#dfn-primary-pointer" id="ref-for-dfn-primary-pointer">primary pointer</a>, and as a non-primary <a data-link-type="dfn" href="#auxiliary-action" id="ref-for-auxiliary-action">auxiliary action</a> for a non-primary pointer.</p>
+   <p>Another example would be intents from the operating system with input derived from sensitive information that cannot be exposed directly, such as interactions based on gaze. These produce a transient <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①④">XRInputSource</a></code> with a <code class="idl"><a data-link-type="idl" href="#dom-xrinputsource-targetraymode" id="ref-for-dom-xrinputsource-targetraymode⑦">targetRayMode</a></code> set to <code class="idl"><a data-link-type="idl" href="#dom-xrtargetraymode-transient-pointer" id="ref-for-dom-xrtargetraymode-transient-pointer③">transient-pointer</a></code>, treated as a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①①">primary action</a>.</p>
+   <p><a data-link-type="dfn" href="#transient-input-sources" id="ref-for-transient-input-sources①">Transient input sources</a> are only present in the session’s <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources⑧">list of active XR input sources</a> for the duration of the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action">transient action</a>.</p>
+   <p><a data-link-type="dfn" href="#transient-input-sources" id="ref-for-transient-input-sources②">Transient input sources</a> follow the following sequence when handling <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action①">transient actions</a> instead of the algorithms for non-transient <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①②">primary actions</a>:</p>
    <div class="algorithm" data-algorithm="on-transient-input-start">
     <p>When a <a data-link-type="dfn" href="#transient-input-sources" id="ref-for-transient-input-sources③">transient input source</a> <var>source</var> for <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①①③">XRSession</a></code> <var>session</var> begins its <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action②">transient action</a> the UA MUST run the following steps:</p>
     <ol>
@@ -2924,7 +2932,7 @@ <h3 class="heading settled" data-level="10.2" id="transient-input"><span class="
        <li data-md>
         <p><a data-link-type="dfn" href="#xrsession-add-input-source" id="ref-for-xrsession-add-input-source①">Add the XR input source</a> to the <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources⑨">list of active XR input sources</a>.</p>
        <li data-md>
-        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action③">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①②">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event⑧">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event">selectstart</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
+        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action③">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①③">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event⑧">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event">selectstart</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
       </ol>
     </ol>
    </div>
@@ -2937,11 +2945,11 @@ <h3 class="heading settled" data-level="10.2" id="transient-input"><span class="
       <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task②⑥">Queue a task</a> to perform the following steps:</p>
       <ol>
        <li data-md>
-        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑤">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①③">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event⑨">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-select" id="ref-for-eventdef-xrsession-select④">select</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
+        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑤">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①④">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event⑨">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-select" id="ref-for-eventdef-xrsession-select④">select</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
        <li data-md>
         <p>Fire any <code>"click"</code> events produced by the <a data-link-type="dfn" href="#xr-input-source" id="ref-for-xr-input-source②⑥">XR input source</a>'s action, if necessary.</p>
        <li data-md>
-        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑥">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①④">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event①⓪">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-selectend" id="ref-for-eventdef-xrsession-selectend④">selectend</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
+        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑥">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑤">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event①⓪">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-selectend" id="ref-for-eventdef-xrsession-selectend④">selectend</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
        <li data-md>
         <p><a data-link-type="dfn" href="#xrsession-remove-input-source" id="ref-for-xrsession-remove-input-source①">Remove the XR input source</a> from the <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources①⓪">list of active XR input sources</a>.</p>
        <li data-md>
@@ -2958,7 +2966,7 @@ <h3 class="heading settled" data-level="10.2" id="transient-input"><span class="
       <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task②⑦">Queue a task</a> to perform the following steps:</p>
       <ol>
        <li data-md>
-        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑧">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑤">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event①①">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-selectend" id="ref-for-eventdef-xrsession-selectend⑤">selectend</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
+        <p>If the <a data-link-type="dfn" href="#transient-action" id="ref-for-transient-action⑧">transient action</a> is a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑥">primary action</a>, <a data-link-type="dfn" href="#fire-an-input-source-event" id="ref-for-fire-an-input-source-event①①">fire an input source event</a> with name <code class="idl"><a class="idl-code" data-link-type="event" href="#eventdef-xrsession-selectend" id="ref-for-eventdef-xrsession-selectend⑤">selectend</a></code>, frame <var>frame</var>, and source <var>source</var>.</p>
        <li data-md>
         <p><a data-link-type="dfn" href="#xrsession-remove-input-source" id="ref-for-xrsession-remove-input-source②">Remove the XR input source</a> from the <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources①①">list of active XR input sources</a>.</p>
        <li data-md>
@@ -2967,16 +2975,16 @@ <h3 class="heading settled" data-level="10.2" id="transient-input"><span class="
     </ol>
    </div>
    <h3 class="heading settled" data-level="10.3" id="xrinputsourcearray-interface"><span class="secno">10.3. </span><span class="content">XRInputSourceArray</span><a class="self-link" href="#xrinputsourcearray-interface"></a></h3>
-   <p>An <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray①">XRInputSourceArray</a></code> represents a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①⑦">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①④">XRInputSource</a></code>s. It is used in favor of a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-frozen-array-type" id="ref-for-dfn-frozen-array-type">frozen array type</a> when the contents of the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①⑧">list</a> are expected to change over time, such as with the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①①⑥">XRSession</a></code> <code class="idl"><a data-link-type="idl" href="#dom-xrsession-inputsources" id="ref-for-dom-xrsession-inputsources②">inputSources</a></code> attribute.</p>
+   <p>An <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray①">XRInputSourceArray</a></code> represents a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①⑦">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑤">XRInputSource</a></code>s. It is used in favor of a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-frozen-array-type" id="ref-for-dfn-frozen-array-type">frozen array type</a> when the contents of the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①⑧">list</a> are expected to change over time, such as with the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①①⑥">XRSession</a></code> <code class="idl"><a data-link-type="idl" href="#dom-xrsession-inputsources" id="ref-for-dom-xrsession-inputsources②">inputSources</a></code> attribute.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext①④"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①③"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="xrinputsourcearray"><code><c- g>XRInputSourceArray</c-></code></dfn> {
-  <c- b>iterable</c->&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource①⑤"><c- n>XRInputSource</c-></a>>;
+  <c- b>iterable</c->&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource①⑥"><c- n>XRInputSource</c-></a>>;
   <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-xrinputsourcearray-length" id="ref-for-dom-xrinputsourcearray-length"><c- g>length</c-></a>;
-  <c- b>getter</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource①⑥"><c- n>XRInputSource</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceArray/__getter__(index)" data-dfn-type="argument" data-export id="dom-xrinputsourcearray-__getter__-index-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-xrinputsourcearray-__getter__-index-index"></a></dfn>);
+  <c- b>getter</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource①⑦"><c- n>XRInputSource</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceArray/__getter__(index)" data-dfn-type="argument" data-export id="dom-xrinputsourcearray-__getter__-index-index"><code><c- g>index</c-></code><a class="self-link" href="#dom-xrinputsourcearray-__getter__-index-index"></a></dfn>);
 };
 </pre>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourceArray" data-dfn-type="attribute" data-export id="dom-xrinputsourcearray-length"><code>length</code></dfn> attribute of <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray②">XRInputSourceArray</a></code> indicates how many <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑦">XRInputSource</a></code>s are contained within the <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray③">XRInputSourceArray</a></code>.</p>
-   <p>The <dfn data-dfn-for="XRInputSourceArray" data-dfn-type="dfn" data-export id="xrinputsourcearray-indexed-property-getter"><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-indexed-property-getter" id="ref-for-dfn-indexed-property-getter">indexed property getter</a><a class="self-link" href="#xrinputsourcearray-indexed-property-getter"></a></dfn> of <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray④">XRInputSourceArray</a></code> retrieves the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑧">XRInputSource</a></code> at the provided index.</p>
+   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourceArray" data-dfn-type="attribute" data-export id="dom-xrinputsourcearray-length"><code>length</code></dfn> attribute of <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray②">XRInputSourceArray</a></code> indicates how many <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑧">XRInputSource</a></code>s are contained within the <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray③">XRInputSourceArray</a></code>.</p>
+   <p>The <dfn data-dfn-for="XRInputSourceArray" data-dfn-type="dfn" data-export id="xrinputsourcearray-indexed-property-getter"><a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-indexed-property-getter" id="ref-for-dfn-indexed-property-getter">indexed property getter</a><a class="self-link" href="#xrinputsourcearray-indexed-property-getter"></a></dfn> of <code class="idl"><a data-link-type="idl" href="#xrinputsourcearray" id="ref-for-xrinputsourcearray④">XRInputSourceArray</a></code> retrieves the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑨">XRInputSource</a></code> at the provided index.</p>
    <h2 class="heading settled" data-level="11" id="layers"><span class="secno">11. </span><span class="content">Layers</span><a class="self-link" href="#layers"></a></h2>
    <p class="note" role="note"><span class="marker">Note:</span> While this specification only defines the <code class="idl"><a data-link-type="idl" href="#xrwebgllayer" id="ref-for-xrwebgllayer⑦">XRWebGLLayer</a></code> layer, future extensions to the spec are expected to add additional layer types and the image sources that they draw from.</p>
    <h3 class="heading settled" data-level="11.1" id="xrlayer-interface"><span class="secno">11.1. </span><span class="content">XRLayer</span><a class="self-link" href="#xrlayer-interface"></a></h3>
@@ -3364,23 +3372,23 @@ <h3 class="heading settled" data-level="12.1" id="xrsessionevent-interface"><spa
 </pre>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRSessionEvent" data-dfn-type="attribute" data-export id="dom-xrsessionevent-session"><code>session</code></dfn> attribute indicates the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⓪">XRSession</a></code> that generated the event.</p>
    <h3 class="heading settled" data-level="12.2" id="xrinputsourceevent-interface"><span class="secno">12.2. </span><span class="content">XRInputSourceEvent</span><a class="self-link" href="#xrinputsourceevent-interface"></a></h3>
-   <p><code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent②">XRInputSourceEvent</a></code>s are fired to indicate changes to the state of an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource①⑨">XRInputSource</a></code>.</p>
+   <p><code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent②">XRInputSourceEvent</a></code>s are fired to indicate changes to the state of an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②⓪">XRInputSource</a></code>.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext①⑧"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①⑦"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="xrinputsourceevent"><code><c- g>XRInputSourceEvent</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#event" id="ref-for-event①"><c- n>Event</c-></a> {
   <dfn class="idl-code" data-dfn-for="XRInputSourceEvent" data-dfn-type="constructor" data-export data-lt="XRInputSourceEvent(type, eventInitDict)|constructor(type, eventInitDict)" id="dom-xrinputsourceevent-xrinputsourceevent"><code><c- g>constructor</c-></code><a class="self-link" href="#dom-xrinputsourceevent-xrinputsourceevent"></a></dfn>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑧"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceEvent/XRInputSourceEvent(type, eventInitDict), XRInputSourceEvent/constructor(type, eventInitDict)" data-dfn-type="argument" data-export id="dom-xrinputsourceevent-xrinputsourceevent-type-eventinitdict-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-xrinputsourceevent-xrinputsourceevent-type-eventinitdict-type"></a></dfn>, <a data-link-type="idl-name" href="#dictdef-xrinputsourceeventinit" id="ref-for-dictdef-xrinputsourceeventinit"><c- n>XRInputSourceEventInit</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceEvent/XRInputSourceEvent(type, eventInitDict), XRInputSourceEvent/constructor(type, eventInitDict)" data-dfn-type="argument" data-export id="dom-xrinputsourceevent-xrinputsourceevent-type-eventinitdict-eventinitdict"><code><c- g>eventInitDict</c-></code><a class="self-link" href="#dom-xrinputsourceevent-xrinputsourceevent-type-eventinitdict-eventinitdict"></a></dfn>);
   [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject①⑦"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#xrframe" id="ref-for-xrframe③⓪"><c- n>XRFrame</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="XRFrame" href="#dom-xrinputsourceevent-frame" id="ref-for-dom-xrinputsourceevent-frame"><c- g>frame</c-></a>;
-  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject①⑧"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⓪"><c- n>XRInputSource</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="XRInputSource" href="#dom-xrinputsourceevent-inputsource" id="ref-for-dom-xrinputsourceevent-inputsource"><c- g>inputSource</c-></a>;
+  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject①⑧"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②①"><c- n>XRInputSource</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="XRInputSource" href="#dom-xrinputsourceevent-inputsource" id="ref-for-dom-xrinputsourceevent-inputsource"><c- g>inputSource</c-></a>;
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-xrinputsourceeventinit"><code><c- g>XRInputSourceEventInit</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#dictdef-eventinit" id="ref-for-dictdef-eventinit①"><c- n>EventInit</c-></a> {
   <c- b>required</c-> <a data-link-type="idl-name" href="#xrframe" id="ref-for-xrframe③①"><c- n>XRFrame</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceEventInit" data-dfn-type="dict-member" data-export data-type="XRFrame " id="dom-xrinputsourceeventinit-frame"><code><c- g>frame</c-></code><a class="self-link" href="#dom-xrinputsourceeventinit-frame"></a></dfn>;
-  <c- b>required</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②①"><c- n>XRInputSource</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceEventInit" data-dfn-type="dict-member" data-export data-type="XRInputSource " id="dom-xrinputsourceeventinit-inputsource"><code><c- g>inputSource</c-></code><a class="self-link" href="#dom-xrinputsourceeventinit-inputsource"></a></dfn>;
+  <c- b>required</c-> <a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②②"><c- n>XRInputSource</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourceEventInit" data-dfn-type="dict-member" data-export data-type="XRInputSource " id="dom-xrinputsourceeventinit-inputsource"><code><c- g>inputSource</c-></code><a class="self-link" href="#dom-xrinputsourceeventinit-inputsource"></a></dfn>;
 };
 </pre>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourceEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceevent-inputsource"><code>inputSource</code></dfn> attribute indicates the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②②">XRInputSource</a></code> that generated this event.</p>
+   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourceEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceevent-inputsource"><code>inputSource</code></dfn> attribute indicates the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②③">XRInputSource</a></code> that generated this event.</p>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourceEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceevent-frame"><code>frame</code></dfn> attribute is an <code class="idl"><a data-link-type="idl" href="#xrframe" id="ref-for-xrframe③②">XRFrame</a></code> that corresponds with the time that the event took place. It may represent historical data. <code class="idl"><a data-link-type="idl" href="#dom-xrframe-getviewerpose" id="ref-for-dom-xrframe-getviewerpose④">getViewerPose()</a></code> MUST throw an exception when called on <code class="idl"><a data-link-type="idl" href="#dom-xrinputsourceevent-frame" id="ref-for-dom-xrinputsourceevent-frame①">frame</a></code>.</p>
    <div class="algorithm" data-algorithm="fire-input-source-event">
-    <p>When the user agent has to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="fire-an-input-source-event">fire an input source event</dfn> with name <var>name</var>, <code class="idl"><a data-link-type="idl" href="#xrframe" id="ref-for-xrframe③③">XRFrame</a></code> <var>frame</var>, and <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②③">XRInputSource</a></code> <var>source</var> it MUST run the following steps:</p>
+    <p>When the user agent has to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="fire-an-input-source-event">fire an input source event</dfn> with name <var>name</var>, <code class="idl"><a data-link-type="idl" href="#xrframe" id="ref-for-xrframe③③">XRFrame</a></code> <var>frame</var>, and <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②④">XRInputSource</a></code> <var>source</var> it MUST run the following steps:</p>
     <ol>
      <li data-md>
       <p>Create an <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent③">XRInputSourceEvent</a></code> <var>event</var> with <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#dom-event-type" id="ref-for-dom-event-type">type</a></code> <var>name</var>, <code class="idl"><a data-link-type="idl" href="#dom-xrinputsourceevent-frame" id="ref-for-dom-xrinputsourceevent-frame②">frame</a></code> <var>frame</var>, and <code class="idl"><a data-link-type="idl" href="#dom-xrinputsourceevent-inputsource" id="ref-for-dom-xrinputsourceevent-inputsource①">inputSource</a></code> <var>source</var>.</p>
@@ -3395,25 +3403,25 @@ <h3 class="heading settled" data-level="12.2" id="xrinputsourceevent-interface">
     </ol>
    </div>
    <h3 class="heading settled" data-level="12.3" id="xrinputsourceschangeevent-interface"><span class="secno">12.3. </span><span class="content">XRInputSourcesChangeEvent</span><a class="self-link" href="#xrinputsourceschangeevent-interface"></a></h3>
-   <p><code class="idl"><a data-link-type="idl" href="#xrinputsourceschangeevent" id="ref-for-xrinputsourceschangeevent④">XRInputSourcesChangeEvent</a></code>s are fired to indicate changes to the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②④">XRInputSource</a></code>s that are available to an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③①">XRSession</a></code>.</p>
+   <p><code class="idl"><a data-link-type="idl" href="#xrinputsourceschangeevent" id="ref-for-xrinputsourceschangeevent④">XRInputSourcesChangeEvent</a></code>s are fired to indicate changes to the <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②⑤">XRInputSource</a></code>s that are available to an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③①">XRSession</a></code>.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext①⑨"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①⑧"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="xrinputsourceschangeevent"><code><c- g>XRInputSourcesChangeEvent</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#event" id="ref-for-event②"><c- n>Event</c-></a> {
   <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="constructor" data-export data-lt="XRInputSourcesChangeEvent(type, eventInitDict)|constructor(type, eventInitDict)" id="dom-xrinputsourceschangeevent-xrinputsourceschangeevent"><code><c- g>constructor</c-></code><a class="self-link" href="#dom-xrinputsourceschangeevent-xrinputsourceschangeevent"></a></dfn>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑨"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEvent/XRInputSourcesChangeEvent(type, eventInitDict), XRInputSourcesChangeEvent/constructor(type, eventInitDict)" data-dfn-type="argument" data-export id="dom-xrinputsourceschangeevent-xrinputsourceschangeevent-type-eventinitdict-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-xrinputsourceschangeevent-xrinputsourceschangeevent-type-eventinitdict-type"></a></dfn>, <a data-link-type="idl-name" href="#dictdef-xrinputsourceschangeeventinit" id="ref-for-dictdef-xrinputsourceschangeeventinit"><c- n>XRInputSourcesChangeEventInit</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEvent/XRInputSourcesChangeEvent(type, eventInitDict), XRInputSourcesChangeEvent/constructor(type, eventInitDict)" data-dfn-type="argument" data-export id="dom-xrinputsourceschangeevent-xrinputsourceschangeevent-type-eventinitdict-eventinitdict"><code><c- g>eventInitDict</c-></code><a class="self-link" href="#dom-xrinputsourceschangeevent-xrinputsourceschangeevent-type-eventinitdict-eventinitdict"></a></dfn>);
   [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject①⑨"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#xrsession" id="ref-for-xrsession①③②"><c- n>XRSession</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="XRSession" href="#dom-xrinputsourceschangeevent-session" id="ref-for-dom-xrinputsourceschangeevent-session"><c- g>session</c-></a>;
-  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject②⓪"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array④"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑤"><c- n>XRInputSource</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="FrozenArray<XRInputSource>" href="#dom-xrinputsourceschangeevent-added" id="ref-for-dom-xrinputsourceschangeevent-added③"><c- g>added</c-></a>;
-  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject②①"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑤"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑥"><c- n>XRInputSource</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="FrozenArray<XRInputSource>" href="#dom-xrinputsourceschangeevent-removed" id="ref-for-dom-xrinputsourceschangeevent-removed②"><c- g>removed</c-></a>;
+  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject②⓪"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array④"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑥"><c- n>XRInputSource</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="FrozenArray<XRInputSource>" href="#dom-xrinputsourceschangeevent-added" id="ref-for-dom-xrinputsourceschangeevent-added③"><c- g>added</c-></a>;
+  [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject②①"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑤"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑦"><c- n>XRInputSource</c-></a>> <a class="idl-code" data-link-type="attribute" data-readonly data-type="FrozenArray<XRInputSource>" href="#dom-xrinputsourceschangeevent-removed" id="ref-for-dom-xrinputsourceschangeevent-removed②"><c- g>removed</c-></a>;
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-xrinputsourceschangeeventinit"><code><c- g>XRInputSourcesChangeEventInit</c-></code></dfn> : <a data-link-type="idl-name" href="https://dom.spec.whatwg.org/#dictdef-eventinit" id="ref-for-dictdef-eventinit②"><c- n>EventInit</c-></a> {
   <c- b>required</c-> <a data-link-type="idl-name" href="#xrsession" id="ref-for-xrsession①③③"><c- n>XRSession</c-></a> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEventInit" data-dfn-type="dict-member" data-export data-type="XRSession " id="dom-xrinputsourceschangeeventinit-session"><code><c- g>session</c-></code><a class="self-link" href="#dom-xrinputsourceschangeeventinit-session"></a></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑥"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑦"><c- n>XRInputSource</c-></a>> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEventInit" data-dfn-type="dict-member" data-export data-type="FrozenArray<XRInputSource> " id="dom-xrinputsourceschangeeventinit-added"><code><c- g>added</c-></code><a class="self-link" href="#dom-xrinputsourceschangeeventinit-added"></a></dfn>;
-  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑦"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑧"><c- n>XRInputSource</c-></a>> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEventInit" data-dfn-type="dict-member" data-export data-type="FrozenArray<XRInputSource> " id="dom-xrinputsourceschangeeventinit-removed"><code><c- g>removed</c-></code><a class="self-link" href="#dom-xrinputsourceschangeeventinit-removed"></a></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑥"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑧"><c- n>XRInputSource</c-></a>> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEventInit" data-dfn-type="dict-member" data-export data-type="FrozenArray<XRInputSource> " id="dom-xrinputsourceschangeeventinit-added"><code><c- g>added</c-></code><a class="self-link" href="#dom-xrinputsourceschangeeventinit-added"></a></dfn>;
+  <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-frozen-array" id="ref-for-idl-frozen-array⑦"><c- b>FrozenArray</c-></a>&lt;<a data-link-type="idl-name" href="#xrinputsource" id="ref-for-xrinputsource②⑨"><c- n>XRInputSource</c-></a>> <dfn class="idl-code" data-dfn-for="XRInputSourcesChangeEventInit" data-dfn-type="dict-member" data-export data-type="FrozenArray<XRInputSource> " id="dom-xrinputsourceschangeeventinit-removed"><code><c- g>removed</c-></code><a class="self-link" href="#dom-xrinputsourceschangeeventinit-removed"></a></dfn>;
 
 };
 </pre>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceschangeevent-session"><code>session</code></dfn> attribute indicates the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③④">XRSession</a></code> that generated the event.</p>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceschangeevent-added"><code>added</code></dfn> attribute is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②①">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource②⑨">XRInputSource</a></code>s that were added to the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑤">XRSession</a></code> at the time of the event.</p>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceschangeevent-removed"><code>removed</code></dfn> attribute is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②②">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⓪">XRInputSource</a></code>s that were removed from the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑥">XRSession</a></code> at the time of the event.</p>
+   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceschangeevent-added"><code>added</code></dfn> attribute is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②①">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⓪">XRInputSource</a></code>s that were added to the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑤">XRSession</a></code> at the time of the event.</p>
+   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="XRInputSourcesChangeEvent" data-dfn-type="attribute" data-export id="dom-xrinputsourceschangeevent-removed"><code>removed</code></dfn> attribute is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②②">list</a> of <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③①">XRInputSource</a></code>s that were removed from the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑥">XRSession</a></code> at the time of the event.</p>
    <h3 class="heading settled" data-level="12.4" id="xrreferencespaceevent-interface"><span class="secno">12.4. </span><span class="content">XRReferenceSpaceEvent</span><a class="self-link" href="#xrreferencespaceevent-interface"></a></h3>
    <p><code class="idl"><a data-link-type="idl" href="#xrreferencespaceevent" id="ref-for-xrreferencespaceevent">XRReferenceSpaceEvent</a></code>s are fired to indicate changes to the state of an <code class="idl"><a data-link-type="idl" href="#xrreferencespace" id="ref-for-xrreferencespace②⑨">XRReferenceSpace</a></code>.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext②⓪"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①⑨"><c- g>Exposed</c-></a>=<c- n>Window</c->]
@@ -3436,12 +3444,12 @@ <h3 class="heading settled" data-level="12.5" id="event-types"><span class="secn
    <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire②">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-visibilitychange"><code>visibilitychange</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrsessionevent" id="ref-for-xrsessionevent③">XRSessionEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑦">XRSession</a></code> each time the <a data-link-type="dfn" href="#xrsession-visibility-state" id="ref-for-xrsession-visibility-state⑨">visibility state</a> of the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑧">XRSession</a></code> has changed.</p>
    <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire③">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-end"><code>end</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrsessionevent" id="ref-for-xrsessionevent④">XRSessionEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①③⑨">XRSession</a></code> when the session ends, either by the application or the user agent.</p>
    <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire④">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-inputsourceschange"><code>inputsourceschange</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceschangeevent" id="ref-for-xrinputsourceschangeevent⑤">XRInputSourcesChangeEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⓪">XRSession</a></code> when the session’s <a data-link-type="dfn" href="#list-of-active-xr-input-sources" id="ref-for-list-of-active-xr-input-sources①②">list of active XR input sources</a> has changed.</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑤">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-selectstart"><code>selectstart</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent④">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④①">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③①">XRInputSource</a></code>s begins its <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑥">primary action</a>. The event MUST be of type .</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑥">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-selectend"><code>selectend</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑤">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④②">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③②">XRInputSource</a></code>s ends its <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑦">primary action</a> or when an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③③">XRInputSource</a></code> that has begun a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑧">primary action</a> is disconnected.</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑦">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-select"><code>select</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑥">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④③">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③④">XRInputSource</a></code>s has fully completed a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑨">primary action</a>.</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑧">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeezestart"><code>squeezestart</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑦">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④④">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑤">XRInputSource</a></code>s begins its <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action⑨">primary squeeze action</a>.</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑨">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeezeend"><code>squeezeend</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑧">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑤">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑥">XRInputSource</a></code>s ends its <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①⓪">primary squeeze action</a> or when an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑦">XRInputSource</a></code> that has begun a <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①①">primary squeeze action</a> is disconnected.</p>
-   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire①⓪">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeeze"><code>squeeze</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑨">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑥">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑧">XRInputSource</a></code>s has fully completed a <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①②">primary squeeze action</a>.</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑤">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-selectstart"><code>selectstart</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent④">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④①">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③②">XRInputSource</a></code>s begins its <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑦">primary action</a>. The event MUST be of type .</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑥">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-selectend"><code>selectend</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑤">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④②">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③③">XRInputSource</a></code>s ends its <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑧">primary action</a> or when an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③④">XRInputSource</a></code> that has begun a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action①⑨">primary action</a> is disconnected.</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑦">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-select"><code>select</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑥">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④③">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑤">XRInputSource</a></code>s has fully completed a <a data-link-type="dfn" href="#primary-action" id="ref-for-primary-action②⓪">primary action</a>.</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑧">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeezestart"><code>squeezestart</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑦">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④④">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑥">XRInputSource</a></code>s begins its <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action⑨">primary squeeze action</a>.</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire⑨">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeezeend"><code>squeezeend</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑧">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑤">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑦">XRInputSource</a></code>s ends its <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①⓪">primary squeeze action</a> or when an <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑧">XRInputSource</a></code> that has begun a <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①①">primary squeeze action</a> is disconnected.</p>
+   <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire①⓪">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-squeeze"><code>squeeze</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrinputsourceevent" id="ref-for-xrinputsourceevent⑨">XRInputSourceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑥">XRSession</a></code> when one of its <code class="idl"><a data-link-type="idl" href="#xrinputsource" id="ref-for-xrinputsource③⑨">XRInputSource</a></code>s has fully completed a <a data-link-type="dfn" href="#primary-squeeze-action" id="ref-for-primary-squeeze-action①②">primary squeeze action</a>.</p>
    <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire①①">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRSession" data-dfn-type="event" data-export id="eventdef-xrsession-frameratechange"><code>frameratechange</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrsessionevent" id="ref-for-xrsessionevent⑤">XRSessionEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑦">XRSession</a></code> when the <a data-link-type="dfn" href="#xr-compositor" id="ref-for-xr-compositor①④">XR Compositor</a> changes the <code class="idl"><a data-link-type="idl" href="#xrsession" id="ref-for-xrsession①④⑧">XRSession</a></code>'s <a data-link-type="dfn" href="#xrsession-internal-nominal-framerate" id="ref-for-xrsession-internal-nominal-framerate⑤">internal nominal framerate</a>.</p>
    <p>A user agent MUST <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-event-fire" id="ref-for-concept-event-fire①②">fire an event</a> named <dfn class="dfn-paneled idl-code" data-dfn-for="XRReferenceSpace" data-dfn-type="event" data-export id="eventdef-xrreferencespace-reset"><code>reset</code></dfn> using <code class="idl"><a data-link-type="idl" href="#xrreferencespaceevent" id="ref-for-xrreferencespaceevent①">XRReferenceSpaceEvent</a></code> on an <code class="idl"><a data-link-type="idl" href="#xrreferencespace" id="ref-for-xrreferencespace③③">XRReferenceSpace</a></code> when discontinuities of the <a data-link-type="dfn" href="#xrspace-native-origin" id="ref-for-xrspace-native-origin①⑧">native origin</a> or <a data-link-type="dfn" href="#xrspace-effective-origin" id="ref-for-xrspace-effective-origin①①">effective origin</a> occur, i.e. there are significant changes in the origin’s position or orientation relative to the user’s environment. (For example: After user recalibration of their XR device or if the XR device automatically shifts its origin after losing and regaining tracking.) A <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset②">reset</a></code> event MUST also be dispatched when the <code class="idl"><a data-link-type="idl" href="#dom-xrboundedreferencespace-boundsgeometry" id="ref-for-dom-xrboundedreferencespace-boundsgeometry⑨">boundsGeometry</a></code> changes for an <code class="idl"><a data-link-type="idl" href="#xrboundedreferencespace" id="ref-for-xrboundedreferencespace①①">XRBoundedReferenceSpace</a></code>. A <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset③">reset</a></code> event MUST NOT be dispatched if the <a data-link-type="dfn" href="#viewer" id="ref-for-viewer①②">viewer</a>'s pose experiences discontinuities but the <code class="idl"><a data-link-type="idl" href="#xrreferencespace" id="ref-for-xrreferencespace③④">XRReferenceSpace</a></code>'s origin physical mapping remains stable, such as when the <a data-link-type="dfn" href="#viewer" id="ref-for-viewer①③">viewer</a> momentarily loses and regains tracking within the same tracking area. A <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset④">reset</a></code> event also MUST NOT be dispatched as an <code class="idl"><a data-link-type="idl" href="#dom-xrreferencespacetype-unbounded" id="ref-for-dom-xrreferencespacetype-unbounded⑥">unbounded</a></code> reference space makes small adjustments to its <a data-link-type="dfn" href="#xrspace-native-origin" id="ref-for-xrspace-native-origin①⑨">native origin</a> over time to maintain space stability near the user, if a significant discontinuity has not occurred. The event MUST be dispatched prior to the execution of any <a data-link-type="dfn" href="#xr-animation-frame" id="ref-for-xr-animation-frame⑥">XR animation frame</a>s that make use of the new origin. A <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset⑤">reset</a></code> event MUST be dispatched on all offset reference spaces of a reference space that fires a <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset⑥">reset</a></code> event, and the <code class="idl"><a data-link-type="idl" href="#dom-xrboundedreferencespace-boundsgeometry" id="ref-for-dom-xrboundedreferencespace-boundsgeometry①⓪">boundsGeometry</a></code> of offset <code class="idl"><a data-link-type="idl" href="#xrboundedreferencespace" id="ref-for-xrboundedreferencespace①②">XRBoundedReferenceSpace</a></code>s should also be recomputed.</p>
    <p class="note" role="note"><span class="marker">Note:</span> This does mean that the session needs to hold on to strong references to any <code class="idl"><a data-link-type="idl" href="#xrreferencespace" id="ref-for-xrreferencespace③⑤">XRReferenceSpace</a></code>s that have <code class="idl"><a data-link-type="idl" href="#eventdef-xrreferencespace-reset" id="ref-for-eventdef-xrreferencespace-reset⑦">reset</a></code> listeners.</p>
@@ -4661,6 +4669,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     </ul>
    <li><a href="#transient-action">transient action</a><span>, in § 10.2</span>
    <li><a href="#transient-input-sources">transient input sources</a><span>, in § 10.2</span>
+   <li><a href="#dom-xrtargetraymode-transient-pointer">"transient-pointer"</a><span>, in § 10.1</span>
+   <li><a href="#dom-xrtargetraymode-transient-pointer">transient-pointer</a><span>, in § 10.1</span>
    <li><a href="#trusted-immersive-ui">trusted immersive UI</a><span>, in § 13.6</span>
    <li><a href="#trusted-ui">Trusted UI</a><span>, in § 13.6</span>
    <li><a href="#xrreferencespace-type">type</a><span>, in § 6.2</span>
@@ -4993,9 +5003,9 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
    <dt id="biblio-infra">[INFRA]
    <dd>Anne van Kesteren; Domenic Denicola. <a href="https://infra.spec.whatwg.org/"><cite>Infra Standard</cite></a>. Living Standard. URL: <a href="https://infra.spec.whatwg.org/">https://infra.spec.whatwg.org/</a>
    <dt id="biblio-permissions">[PERMISSIONS]
-   <dd>Marcos Caceres; Mike Taylor. <a href="https://www.w3.org/TR/permissions/"><cite>Permissions</cite></a>. 13 June 2023. WD. URL: <a href="https://www.w3.org/TR/permissions/">https://www.w3.org/TR/permissions/</a>
+   <dd>Marcos Caceres; Mike Taylor. <a href="https://www.w3.org/TR/permissions/"><cite>Permissions</cite></a>. 16 January 2024. WD. URL: <a href="https://www.w3.org/TR/permissions/">https://www.w3.org/TR/permissions/</a>
    <dt id="biblio-permissions-policy-1">[PERMISSIONS-POLICY-1]
-   <dd>Ian Clelland. <a href="https://www.w3.org/TR/permissions-policy-1/"><cite>Permissions Policy</cite></a>. 17 July 2023. WD. URL: <a href="https://www.w3.org/TR/permissions-policy-1/">https://www.w3.org/TR/permissions-policy-1/</a>
+   <dd>Ian Clelland. <a href="https://www.w3.org/TR/permissions-policy-1/"><cite>Permissions Policy</cite></a>. 18 December 2023. WD. URL: <a href="https://www.w3.org/TR/permissions-policy-1/">https://www.w3.org/TR/permissions-policy-1/</a>
    <dt id="biblio-pointerevents">[POINTEREVENTS]
    <dd>Jacob Rossi; Matt Brubeck. <a href="https://www.w3.org/TR/pointerevents/"><cite>Pointer Events</cite></a>. 4 April 2019. REC. URL: <a href="https://www.w3.org/TR/pointerevents/">https://www.w3.org/TR/pointerevents/</a>
    <dt id="biblio-pointerlock">[POINTERLOCK]
@@ -5014,7 +5024,7 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
   <h3 class="no-num no-ref heading settled" id="informative"><span class="content">Informative References</span><a class="self-link" href="#informative"></a></h3>
   <dl>
    <dt id="biblio-device-orientation">[DEVICE-ORIENTATION]
-   <dd>Reilly Grant; Raphael Kubo da Costa. <a href="https://www.w3.org/TR/orientation-event/"><cite>DeviceOrientation Event Specification</cite></a>. 21 April 2023. WD. URL: <a href="https://www.w3.org/TR/orientation-event/">https://www.w3.org/TR/orientation-event/</a>
+   <dd>Reilly Grant; Raphael Kubo da Costa. <a href="https://www.w3.org/TR/orientation-event/"><cite>DeviceOrientation Event Specification</cite></a>. 2 February 2024. WD. URL: <a href="https://www.w3.org/TR/orientation-event/">https://www.w3.org/TR/orientation-event/</a>
    <dt id="biblio-webxr-ar-module-1">[WEBXR-AR-MODULE-1]
    <dd>Brandon Jones; Manish Goregaokar; Rik Cabanier. <a href="https://www.w3.org/TR/webxr-ar-module-1/"><cite>WebXR Augmented Reality Module - Level 1</cite></a>. 2 November 2022. CR. URL: <a href="https://www.w3.org/TR/webxr-ar-module-1/">https://www.w3.org/TR/webxr-ar-module-1/</a>
   </dl>
@@ -5183,7 +5193,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 <c- b>enum</c-> <a href="#enumdef-xrtargetraymode"><code><c- g>XRTargetRayMode</c-></code></a> {
   <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-gaze"><c- s>"gaze"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-tracked-pointer"><c- s>"tracked-pointer"</c-></a>,
-  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-screen"><c- s>"screen"</c-></a>
+  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-screen"><c- s>"screen"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-xrtargetraymode-transient-pointer"><c- s>"transient-pointer"</c-></a>
 };
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>Window</c->]
@@ -7759,18 +7770,19 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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