From facd2c67276aaa64d51dd2910fbaa8e70c962491 Mon Sep 17 00:00:00 2001
From: Yao Xiao <xyaof3@126.com>
Date: Wed, 25 Sep 2024 15:41:10 +0000
Subject: [PATCH] fix spec

SHA: 5e07172623fef80aaba67104fcffa872ce5ba7b9
Reason: push, by xyaoinum

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 52 +++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 35 insertions(+), 17 deletions(-)

diff --git a/index.html b/index.html
index 298be34..d3c705a 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2021/W3C-UD" rel="stylesheet">
   <meta content="Bikeshed version 6270e4735, updated Tue Aug 6 12:12:30 2024 -0700" name="generator">
   <link href="https://github.com/patcg-individual-drafts/topics" rel="canonical">
-  <meta content="e56d8e02a07ef8930c0b9dc69466f0652ec5522e" name="revision">
+  <meta content="5e07172623fef80aaba67104fcffa872ce5ba7b9" name="revision">
   <meta content="dark light" name="color-scheme">
   <link href="https://www.w3.org/StyleSheets/TR/2021/dark.css" media="(prefers-color-scheme: dark)" rel="stylesheet" type="text/css">
 <style>
@@ -787,7 +787,11 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
    <ol class="toc" role="directory">
     <li><a href="#introduction-header"><span class="secno">1</span> <span class="content">Introduction</span></a>
     <li><a href="#terminology-and-types-header"><span class="secno">2</span> <span class="content">Terminology and types</span></a>
-    <li><a href="#user-agent-associated-state-header"><span class="secno">3</span> <span class="content">User agent associated state</span></a>
+    <li>
+     <a href="#user-agent-associated-state-header"><span class="secno">3</span> <span class="content">User agent associated state</span></a>
+     <ol class="toc">
+      <li><a href="#expiring-stored-data"><span class="secno">3.1</span> <span class="content">Expiring stored data</span></a>
+     </ol>
     <li><a href="#browsing-topic-dictionary-header"><span class="secno">4</span> <span class="content">BrowsingTopic dictionary</span></a>
     <li><a href="#document-id-header"><span class="secno">5</span> <span class="content">document ID</span></a>
     <li><a href="#determine-topics-calculation-input-data-header"><span class="secno">6</span> <span class="content">Determine topics calculation input data</span></a>
@@ -938,6 +942,8 @@ <h2 class="heading settled" data-level="3" id="user-agent-associated-state-heade
     <p>Each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#user-agent" id="ref-for-user-agent③">user agent</a> has an associated topics algorithm configuration (identified by <a data-link-type="dfn" href="#browsing-topics-types-configuration-version" id="ref-for-browsing-topics-types-configuration-version①">configuration version</a> <dfn class="dfn-paneled" data-dfn-for="user agent" data-dfn-type="dfn" data-noexport id="user-agent-configuration-version">configuration version</dfn>). The initial value and meaning is browser defined.</p>
     <p class="note" role="note"><span class="marker">Note:</span> The <a data-link-type="dfn" href="#browsing-topics-types-configuration-version" id="ref-for-browsing-topics-types-configuration-version②">configuration version</a> allows the browser vendor to provide algorithms different from the ones specified in this specification. For example, for some of the algorithms in this specification, it may be possible to use a different constant value, while the system overall still has utility and <a href="#privacy-considerations-header">meets the privacy goals</a>.</p>
     <p>When the <a data-link-type="dfn" href="#user-agent-configuration-version" id="ref-for-user-agent-configuration-version">configuration version</a> is updated, the browser must properly migrate or delete data in <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state">user topics state</a> and <a data-link-type="dfn" href="#user-agent-topics-history-storage" id="ref-for-user-agent-topics-history-storage">topics history storage</a> so that the state and the configuration are consistent.</p>
+    <h3 class="heading settled" data-level="3.1" id="expiring-stored-data"><span class="secno">3.1. </span><span class="content">Expiring stored data</span><a class="self-link" href="#expiring-stored-data"></a></h3>
+     User agents must automatically delete stored data 28 days after its creation. 
     <h2 class="heading settled" data-level="4" id="browsing-topic-dictionary-header"><span class="secno">4. </span><span class="content">BrowsingTopic dictionary</span><a class="self-link" href="#browsing-topic-dictionary-header"></a></h2>
      The <code class="idl"><a data-link-type="idl" href="#dictdef-browsingtopic" id="ref-for-dictdef-browsingtopic">BrowsingTopic</a></code> dictionary is used to contain the IDL correspondences of <a data-link-type="dfn" href="#browsing-topics-types-topic-ids" id="ref-for-browsing-topics-types-topic-ids⑦">topic id</a>, <a data-link-type="dfn" href="#browsing-topics-types-version" id="ref-for-browsing-topics-types-version①">version</a>, <a data-link-type="dfn" href="#browsing-topics-types-configuration-version" id="ref-for-browsing-topics-types-configuration-version③">configuration version</a>, <a data-link-type="dfn" href="#browsing-topics-types-taxonomy-version" id="ref-for-browsing-topics-types-taxonomy-version②">taxonomy version</a>, and <a data-link-type="dfn" href="#browsing-topics-types-model-version" id="ref-for-browsing-topics-types-model-version②">model version</a>. 
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-browsingtopic"><code><c- g>BrowsingTopic</c-></code></dfn> {
@@ -1250,6 +1256,14 @@ <h2 class="heading settled" data-level="11" id="epochs-for-caller-header"><span
        <p>Let <var>epochSwitchTimeDecisionHash</var> be 64-bit truncation of <var>epochSwitchTimeDecisionHmacOutput</var>.</p>
       <li data-md>
        <p>Let <var>epochSwitchTimeDelayIntroduction</var> be a <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#dfn-duration" id="ref-for-dfn-duration①⓪">duration</a> of (<var>epochSwitchTimeDecisionHash</var> % 172800) seconds (i.e. 172800 is 2 days in seconds).</p>
+      <li data-md>
+       <p>Let <var>epochPhaseOutTimeDecisionMessageArray</var> be the concatenation of "epoch-phase-out-time-decision|", <var>lastEpochTime</var>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain①">top level context domain</a>.</p>
+      <li data-md>
+       <p>Let <var>epochPhaseOutTimeDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3①">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①⓪">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key②">hmac key</a>, and message_array=<var>epochPhaseOutTimeDecisionMessageArray</var>.</p>
+      <li data-md>
+       <p>Let <var>epochPhaseOutTimeDecisionHash</var> be 64-bit truncation of <var>epochPhaseOutTimeDecisionHmacOutput</var>.</p>
+      <li data-md>
+       <p>Let <var>epochPhaseOutTimeOffset</var> be a <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#dfn-duration" id="ref-for-dfn-duration①①">duration</a> of (<var>epochPhaseOutTimeDecisionHash</var> % 172800) seconds (i.e. 172800 is 2 days in seconds).</p>
       <li data-md>
        <p>Let <var>timestamp</var> be <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-timestamp" id="ref-for-topics-caller-context-timestamp">timestamp</a>.</p>
       <li data-md>
@@ -1279,9 +1293,13 @@ <h2 class="heading settled" data-level="11" id="epochs-for-caller-header"><span
        <ol>
         <li data-md>
          <p>Let <var>i</var> be <var>startEpochIndex</var>.</p>
+        <li data-md>
+         <p>Let <var>epochRetentionDuration</var> be a <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#dfn-duration" id="ref-for-dfn-duration①②">duration</a> of 28 days.</p>
         <li data-md>
          <p>While <var>i</var> ≤ <var>endEpochIndex</var>:</p>
          <ol>
+          <li data-md>
+           <p>If <var>epochs</var>[<var>i</var>]'s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time③">time</a> &lt; <var>timestamp</var> - <var>epochRetentionDuration</var> + <var>epochPhaseOutTimeOffset</var>, then continue.</p>
           <li data-md>
            <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append⑥">Append</a> <var>epochs</var>[<var>i</var>] to <var>result</var>.</p>
           <li data-md>
@@ -1292,7 +1310,7 @@ <h2 class="heading settled" data-level="11" id="epochs-for-caller-header"><span
        <p>Return <var>result</var>.</p>
      </ol>
     </div>
-    <div class="note" role="note"> This roughly returns 3 recently calculated epochs, either counting back from the last epoch, or from the second to the last epoch. The decision depends on whether some fixed duration (between 0 and 2 days, sticky to a user agent, site, and the last epoch) has passed since the last epoch was calculated. This essentially adds a per-site per-epoch fixed delay to the epoch switch time, to make it harder to correlate the same user across sites via the time that topics are changed, or via the time interval between two changes. The HMAC helps to compute the per-site per-epoch delay on the fly, without needing to store extra data for each site or epoch. </div>
+    <div class="note" role="note"> This roughly returns 3 recently calculated epochs, either counting back from the last epoch, or from the second to the last epoch, and excludes any epochs that are too old. The new epoch is introduced after a fixed duration (between 0 and 2 days) has elapsed since the epoch’s calculation time. Each epoch expires after a longer fixed interval (between 26 and 28 days). Both durations are specific to each user, site, and epoch. This mechanism makes it harder to correlate the same user across sites via the time that topics are changed, or via the time interval between two changes. The HMAC helps to compute the per-user per-site per-epoch delay on the fly, without needing to store extra data for each site or epoch. </div>
     <h2 class="heading settled" data-level="12" id="get-the-number-of-distinct-versions-in-epochs-header"><span class="secno">12. </span><span class="content">Get the number of distinct versions in epochs</span><a class="self-link" href="#get-the-number-of-distinct-versions-in-epochs-header"></a></h2>
     <div class="algorithm" data-algorithm="get the number of distinct versions in epochs">
       To <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="get-the-number-of-distinct-versions-in-epochs">get the number of distinct versions in epochs</dfn>, given a <a data-link-type="dfn" href="#browsing-topics-types-topics-caller-context" id="ref-for-browsing-topics-types-topics-caller-context①">topics caller context</a> <var>callerContext</var>, perform the following steps. They return an integer. 
@@ -1329,9 +1347,9 @@ <h2 class="heading settled" data-level="13" id="topics-for-caller-header"><span
         <li data-md>
          <p>Let <var>topic</var> be null.</p>
         <li data-md>
-         <p>Let <var>topTopicIndexDecisionMessageArray</var> be the concatenation of "top-topic-index-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time③">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain①">top level context domain</a>.</p>
+         <p>Let <var>topTopicIndexDecisionMessageArray</var> be the concatenation of "top-topic-index-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time④">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain②">top level context domain</a>.</p>
         <li data-md>
-         <p>Let <var>topTopicIndexDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3①">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①⓪">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key②">hmac key</a>, and message_array=<var>topTopicIndexDecisionMessageArray</var>.</p>
+         <p>Let <var>topTopicIndexDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3②">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①①">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key③">hmac key</a>, and message_array=<var>topTopicIndexDecisionMessageArray</var>.</p>
         <li data-md>
          <p>Let <var>topTopicIndexDecisionHash</var> be 64-bit truncation of <var>topTopicIndexDecisionHmacOutput</var>.</p>
         <li data-md>
@@ -1349,18 +1367,18 @@ <h2 class="heading settled" data-level="13" id="topics-for-caller-header"><span
         <li data-md>
          <p>If <var>topic</var> is null, or if <var>topic</var>’s <code class="idl"><a data-link-type="idl" href="#dom-browsingtopic-topic" id="ref-for-dom-browsingtopic-topic③">topic</a></code> is 0 (i.e. the candidate topic was cleared), then continue.</p>
         <li data-md>
-         <p>Let <var>randomOrTopTopicDecisionMessageArray</var> be the concatenation of "random-or-top-topic-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time④">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain②">top level context domain</a>.</p>
+         <p>Let <var>randomOrTopTopicDecisionMessageArray</var> be the concatenation of "random-or-top-topic-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time⑤">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain③">top level context domain</a>.</p>
         <li data-md>
-         <p>Let <var>randomOrTopTopicDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3②">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①①">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key③">hmac key</a>, and message_array=<var>randomOrTopTopicDecisionMessageArray</var>.</p>
+         <p>Let <var>randomOrTopTopicDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3③">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①②">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key④">hmac key</a>, and message_array=<var>randomOrTopTopicDecisionMessageArray</var>.</p>
         <li data-md>
          <p>Let <var>randomOrTopTopicDecisionHash</var> be 64-bit truncation of <var>randomOrTopTopicDecisionHmacOutput</var>.</p>
         <li data-md>
          <p>If <var>randomOrTopTopicDecisionHash</var> % 100 &lt; 5:</p>
          <ol>
           <li data-md>
-           <p>Let <var>randomTopicIndexDecisionMessageArray</var> be the concatenation of "random-topic-index-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time⑤">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain③">top level context domain</a>.</p>
+           <p>Let <var>randomTopicIndexDecisionMessageArray</var> be the concatenation of "random-topic-index-decision|", <var>epoch</var>’s <a data-link-type="dfn" href="#epoch-time" id="ref-for-epoch-time⑥">time</a>, and <var>callerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain④">top level context domain</a>.</p>
           <li data-md>
-           <p>Let <var>randomTopicIndexDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3③">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①②">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key④">hmac key</a>, and message_array=<var>randomTopicIndexDecisionMessageArray</var>.</p>
+           <p>Let <var>randomTopicIndexDecisionHmacOutput</var> be the output of the <a data-link-type="dfn" href="https://www.rfc-editor.org/rfc/rfc6234#section-8.3" id="ref-for-section-8.3④">HMAC algorithm</a>, given input parameters: whichSha=SHA256, key=user agent’s <a data-link-type="dfn" href="#user-agent-user-topics-state" id="ref-for-user-agent-user-topics-state①③">user topics state</a>'s <a data-link-type="dfn" href="#user-topics-state-hmac-key" id="ref-for-user-topics-state-hmac-key⑤">hmac key</a>, and message_array=<var>randomTopicIndexDecisionMessageArray</var>.</p>
           <li data-md>
            <p>Let <var>randomTopicIndexDecisionHash</var> be 64-bit truncation of <var>randomTopicIndexDecisionHmacOutput</var>.</p>
           <li data-md>
@@ -1416,7 +1434,7 @@ <h2 class="heading settled" data-level="14" id="the-javascript-api-header"><span
       <li data-md>
        <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-caller-domain" id="ref-for-topics-caller-context-caller-domain①">caller domain</a> to <var>document</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-document-origin" id="ref-for-concept-document-origin">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain①">registrable domain</a>.</p>
       <li data-md>
-       <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain④">top level context domain</a> to <var>topLevelDocument</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-document-origin" id="ref-for-concept-document-origin①">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host①">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain②">registrable domain</a>.</p>
+       <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain⑤">top level context domain</a> to <var>topLevelDocument</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-document-origin" id="ref-for-concept-document-origin①">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host①">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain②">registrable domain</a>.</p>
       <li data-md>
        <p>Let <var>unsafeMoment</var> be the <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#dfn-wall-clock" id="ref-for-dfn-wall-clock⑥">wall clock</a>'s <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#wall-clock-unsafe-current-time" id="ref-for-wall-clock-unsafe-current-time③">unsafe current time</a>.</p>
       <li data-md>
@@ -1549,7 +1567,7 @@ <h3 class="heading settled" data-level="15.8" id="append-or-modify-a-request-sec
       <li data-md>
        <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-caller-domain" id="ref-for-topics-caller-context-caller-domain③">caller domain</a> to <var>requestOrigin</var>’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host②">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain③">registrable domain</a>.</p>
       <li data-md>
-       <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain⑤">top level context domain</a> to <var>topLevelDocument</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-document-origin" id="ref-for-concept-document-origin④">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host③">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain④">registrable domain</a>.</p>
+       <p>Set <var>topicsCallerContext</var>’s <a data-link-type="dfn" href="#topics-caller-context-top-level-context-domain" id="ref-for-topics-caller-context-top-level-context-domain⑥">top level context domain</a> to <var>topLevelDocument</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-document-origin" id="ref-for-concept-document-origin④">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#concept-origin-host" id="ref-for-concept-origin-host③">host</a>'s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-registrable-domain" id="ref-for-host-registrable-domain④">registrable domain</a>.</p>
       <li data-md>
        <p>Let <var>unsafeMoment</var> be the <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#dfn-wall-clock" id="ref-for-dfn-wall-clock⑧">wall clock</a>'s <a data-link-type="dfn" href="https://w3c.github.io/hr-time/#wall-clock-unsafe-current-time" id="ref-for-wall-clock-unsafe-current-time④">unsafe current time</a>.</p>
       <li data-md>
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@@ -2303,7 +2321,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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@@ -2372,7 +2390,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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 "epoch-taxonomy": {"dfnID":"epoch-taxonomy","dfnText":"taxonomy","external":false,"refSections":[{"refs":[{"id":"ref-for-epoch-taxonomy"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-epoch-taxonomy\u2460"},{"id":"ref-for-epoch-taxonomy\u2461"}],"title":"13. Topics for caller"}],"url":"#epoch-taxonomy"},
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-"epoch-time": {"dfnID":"epoch-time","dfnText":"time","external":false,"refSections":[{"refs":[{"id":"ref-for-epoch-time"},{"id":"ref-for-epoch-time\u2460"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-epoch-time\u2461"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-epoch-time\u2462"},{"id":"ref-for-epoch-time\u2463"},{"id":"ref-for-epoch-time\u2464"}],"title":"13. Topics for caller"}],"url":"#epoch-time"},
+"epoch-time": {"dfnID":"epoch-time","dfnText":"time","external":false,"refSections":[{"refs":[{"id":"ref-for-epoch-time"},{"id":"ref-for-epoch-time\u2460"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-epoch-time\u2461"},{"id":"ref-for-epoch-time\u2462"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-epoch-time\u2463"},{"id":"ref-for-epoch-time\u2464"},{"id":"ref-for-epoch-time\u2465"}],"title":"13. Topics for caller"}],"url":"#epoch-time"},
 "epoch-top-5-topics-with-caller-domains": {"dfnID":"epoch-top-5-topics-with-caller-domains","dfnText":"top 5 topics with caller domains","external":false,"refSections":[{"refs":[{"id":"ref-for-epoch-top-5-topics-with-caller-domains"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-epoch-top-5-topics-with-caller-domains\u2460"},{"id":"ref-for-epoch-top-5-topics-with-caller-domains\u2461"}],"title":"13. Topics for caller"}],"url":"#epoch-top-5-topics-with-caller-domains"},
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 "f7b00a8b": {"dfnID":"f7b00a8b","dfnText":"header list (for response)","external":true,"refSections":[{"refs":[{"id":"ref-for-concept-response-header-list"}],"title":"15.9. The `Observe-Browsing-Topics` HTTP response header"}],"url":"https://fetch.spec.whatwg.org/#concept-response-header-list"},
@@ -2388,7 +2406,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 "topic-with-caller-domains-topic-id": {"dfnID":"topic-with-caller-domains-topic-id","dfnText":"topic id","external":false,"refSections":[{"refs":[{"id":"ref-for-topic-with-caller-domains-topic-id"},{"id":"ref-for-topic-with-caller-domains-topic-id\u2460"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-topic-with-caller-domains-topic-id\u2461"}],"title":"13. Topics for caller"}],"url":"#topic-with-caller-domains-topic-id"},
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 "topics-caller-context-timestamp": {"dfnID":"topics-caller-context-timestamp","dfnText":"timestamp","external":false,"refSections":[{"refs":[{"id":"ref-for-topics-caller-context-timestamp"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-topics-caller-context-timestamp\u2460"}],"title":"14. The JavaScript API"},{"refs":[{"id":"ref-for-topics-caller-context-timestamp\u2461"}],"title":"15.8. Append or modify a request Sec-Browsing-Topics header"}],"url":"#topics-caller-context-timestamp"},
-"topics-caller-context-top-level-context-domain": {"dfnID":"topics-caller-context-top-level-context-domain","dfnText":"top level context domain","external":false,"refSections":[{"refs":[{"id":"ref-for-topics-caller-context-top-level-context-domain"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-topics-caller-context-top-level-context-domain\u2460"},{"id":"ref-for-topics-caller-context-top-level-context-domain\u2461"},{"id":"ref-for-topics-caller-context-top-level-context-domain\u2462"}],"title":"13. Topics for caller"},{"refs":[{"id":"ref-for-topics-caller-context-top-level-context-domain\u2463"}],"title":"14. The JavaScript API"},{"refs":[{"id":"ref-for-topics-caller-context-top-level-context-domain\u2464"}],"title":"15.8. Append or modify a request Sec-Browsing-Topics header"}],"url":"#topics-caller-context-top-level-context-domain"},
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@@ -2399,9 +2417,9 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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+"user-agent-user-topics-state": {"dfnID":"user-agent-user-topics-state","dfnText":"user topics state","external":false,"refSections":[{"refs":[{"id":"ref-for-user-agent-user-topics-state"}],"title":"3. User agent associated state"},{"refs":[{"id":"ref-for-user-agent-user-topics-state\u2460"},{"id":"ref-for-user-agent-user-topics-state\u2461"},{"id":"ref-for-user-agent-user-topics-state\u2462"},{"id":"ref-for-user-agent-user-topics-state\u2463"},{"id":"ref-for-user-agent-user-topics-state\u2464"},{"id":"ref-for-user-agent-user-topics-state\u2465"},{"id":"ref-for-user-agent-user-topics-state\u2466"}],"title":"10. Periodically calculate user topics"},{"refs":[{"id":"ref-for-user-agent-user-topics-state\u2467"},{"id":"ref-for-user-agent-user-topics-state\u2468"},{"id":"ref-for-user-agent-user-topics-state\u2460\u24ea"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-user-agent-user-topics-state\u2460\u2460"},{"id":"ref-for-user-agent-user-topics-state\u2460\u2461"},{"id":"ref-for-user-agent-user-topics-state\u2460\u2462"}],"title":"13. Topics for caller"}],"url":"#user-agent-user-topics-state"},
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-"user-topics-state-hmac-key": {"dfnID":"user-topics-state-hmac-key","dfnText":"hmac key","external":false,"refSections":[{"refs":[{"id":"ref-for-user-topics-state-hmac-key"}],"title":"3. User agent associated state"},{"refs":[{"id":"ref-for-user-topics-state-hmac-key\u2460"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-user-topics-state-hmac-key\u2461"},{"id":"ref-for-user-topics-state-hmac-key\u2462"},{"id":"ref-for-user-topics-state-hmac-key\u2463"}],"title":"13. Topics for caller"}],"url":"#user-topics-state-hmac-key"},
+"user-topics-state-hmac-key": {"dfnID":"user-topics-state-hmac-key","dfnText":"hmac key","external":false,"refSections":[{"refs":[{"id":"ref-for-user-topics-state-hmac-key"}],"title":"3. User agent associated state"},{"refs":[{"id":"ref-for-user-topics-state-hmac-key\u2460"},{"id":"ref-for-user-topics-state-hmac-key\u2461"}],"title":"11. Epochs for caller"},{"refs":[{"id":"ref-for-user-topics-state-hmac-key\u2462"},{"id":"ref-for-user-topics-state-hmac-key\u2463"},{"id":"ref-for-user-topics-state-hmac-key\u2464"}],"title":"13. Topics for caller"}],"url":"#user-topics-state-hmac-key"},
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