From f5dd9315e97188d2457ed34e14c4fc74ec024ed0 Mon Sep 17 00:00:00 2001
From: Viktoria Zlatinova <vizlatin@microsoft.com>
Date: Wed, 24 Sep 2025 14:17:20 -0700
Subject: [PATCH 1/2] Add external <script type=speculationrules>

---
 source | 135 +++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 84 insertions(+), 51 deletions(-)

diff --git a/source b/source
index e08cc11ae40..84c0fceefe7 100644
--- a/source
+++ b/source
@@ -63803,11 +63803,12 @@ interface <dfn interface>HTMLScriptElement</dfn> : <span>HTMLElement</span> {
 
   <p>The second core attribute is the <dfn for="script" element-attr><code
   data-x="attr-script-src">src</code></dfn> attribute. It must only be specified for <span
-  data-x="classic script">classic scripts</span> and <span data-x="JavaScript module
-  script">JavaScript module scripts</span>, and denotes that instead of using the element's
-  <span>child text content</span> as the script content, the script will be fetched from the
-  specified <span>URL</span>. If <code data-x="attr-script-src">src</code> is specified, it must be
-  a <span>valid non-empty URL potentially surrounded by spaces</span>.</p>
+  data-x="classic script">classic scripts</span>, <span data-x="JavaScript module script">JavaScript
+  module scripts</span>, and <span data-x="speculation rule set">speculation rules</span>, and
+  denotes that instead of using the element's <span>child text content</span> as the script content,
+  the script will be fetched from the specified <span>URL</span>. If <code
+  data-x="attr-script-src">src</code> is specified, it must be a <span>valid non-empty URL
+  potentially surrounded by spaces</span>.</p>
 
   <p>Which other attributes may be specified on a given <code>script</code> element is determined by
   the following table:</p>
@@ -63876,7 +63877,17 @@ interface <dfn interface>HTMLScriptElement</dfn> : <span>HTMLElement</span> {
      <td class="no">&middot;</td>
      <td class="no">&middot;</td>
     <tr>
-     <th>Speculation rules</th>
+     <th>External speculation rules</th>
+     <td class="no">&middot;</td>
+     <td class="yes">Yes</td>
+     <td class="no">&middot;</td>
+     <td class="no">&middot;</td>
+     <td class="yes">Yes</td>
+     <td class="yes">Yes</td>
+     <td class="yes">Yes</td>
+     <td class="yes">Yes</td>
+    <tr>
+     <th>Inline speculation rules</th>
      <td class="no">&middot;</td>
      <td class="no">&middot;</td>
      <td class="no">&middot;</td>
@@ -64744,15 +64755,14 @@ document.body.append(script1, script2);
     <ol>
      <li>
       <p>If <var>el</var>'s <span data-x="concept-script-type">type</span> is "<code
-      data-x="">importmap</code>" or "<code data-x="">speculationrules</code>", then <span>queue an
-      element task</span> on the <span>DOM manipulation task source</span> given <var>el</var> to
-      <span data-x="concept-event-fire">fire an event</span> named <code
-      data-x="event-error">error</code> at <var>el</var>, and return.</p>
+      data-x="">importmap</code>", then <span>queue an element task</span> on the <span>DOM
+      manipulation task source</span> given <var>el</var> to <span data-x="concept-event-fire">fire
+      an event</span> named <code data-x="event-error">error</code> at <var>el</var>, and
+      return.</p>
 
-      <p class="note">External import maps and speculation rules are not currently supported. See <a
-      href="https://github.com/WICG/import-maps/issues/235">WICG/import-maps issue #235</a> and <a
-      href="https://github.com/WICG/nav-speculation/issues/348">WICG/nav-speculation issue #348</a>
-      for discussions on adding support.</p>
+      <p class="note">External import maps are not currently supported. See <a
+      href="https://github.com/WICG/import-maps/issues/235">WICG/import-maps issue #235</a> for
+      discussions on adding support.</p>
      </li>
 
      <li><p>Let <var>src</var> be the value of <var>el</var>'s <code
@@ -64814,6 +64824,21 @@ document.body.append(script1, script2);
         <p><span>Fetch an external module script graph</span> given <var>url</var>, <var>settings
         object</var>, <var>options</var>, and <var>onComplete</var>.</p>
        </dd>
+
+       <dt>"<code data-x="">speculationrules</code>"</dt>
+       <dd>
+        <ol>
+        <li><p>Let <var>speculationRulesText</var> be the result of <span data-x="fetch speculation
+        rules">fetching speculation rules</span> given <var>url</var> and
+        <var>document</var>.</p></li>
+
+        <li><p>Let <var>result</var> be the result of <span data-x="create a speculation rules parse
+        result">creating a speculation rules parse result</span> given
+        <var>speculationRulesText</var> and <var>document</var>.</p></li>
+
+        <li><p>Run <var>onComplete</var> given <var>result</var>.</p></li>
+        </ol>
+       </dd>
       </dl>
 
       <p>For performance reasons, user agents may start fetching the classic script or module graph
@@ -108688,7 +108713,7 @@ new PaymentRequest(&hellip;); // Allowed to use
   are delivered as JSON documents, via either:</p>
 
   <ul>
-   <li><p>inline <code>script</code> elements with their <code data-x="attr-script-type">type</code>
+   <li><p><code>script</code> elements with their <code data-x="attr-script-type">type</code>
    attribute set to "<code data-x="">speculationrules</code>"; or</p></li>
 
    <li><p>resources fetched from a URL specified in the `<code>Speculation-Rules</code>` HTTP
@@ -110404,45 +110429,19 @@ new PaymentRequest(&hellip;); // Allowed to use
         steps:</p>
 
         <ol>
-         <li><p>Let <var>request</var> be a new <span data-x="concept-request">request</span> whose
-         <span data-x="concept-request-url">URL</span> is <var>url</var>, <span
-         data-x="concept-request-destination">destination</span> is "<code
-         data-x="">speculationrules</code>", and <span data-x="concept-request-mode">mode</span> is
-         "<code data-x="">cors</code>".</p></li>
+          <li><p>Let <var>speculationRulesText</var> be the result of <span data-x="fetch
+          speculation rules">fetching speculation rules</span> given <var>url</var> and
+          <var>document</var>.</p></li>
 
-         <li>
-          <p><span data-x="concept-fetch">Fetch</span> <var>request</var> with the following <i
-          data-x="processResponseConsumeBody">processResponseConsumeBody</i> steps given <span
-          data-x="concept-response">response</span> <var>response</var> and null, failure, or a
-          <span>byte sequence</span> <var>bodyBytes</var>:</p>
-
-          <ol>
-           <li><p>If <var>bodyBytes</var> is null or failure, then abort these steps.</p></li>
-
-           <li><p>If <var>response</var>'s <span data-x="concept-response-status">status</span> is
-           not an <span>ok status</span>, then abort these steps.</p></li>
-
-           <li><p>If the result of <span data-x="extract a MIME type">extracting a MIME type</span>
-           from <var>response</var>'s <span data-x="concept-response-header-list">header list</span>
-           does not have an <span data-x="MIME type essence">essence</span> of
-           "<code>application/speculationrules+json</code>", then abort these steps.</p></li>
-
-           <li><p>Let <var>bodyText</var> be the result of <span data-x="UTF-8 decode">UTF-8
-           decoding</span> <var>bodyBytes</var>.</p></li>
+          <li><p>Let <var>ruleSet</var> be the result of <span data-x="parse a speculation rule set
+          string" >parsing a speculation rule set string</span> given
+          <var>speculationRulesText</var>, <var>document</var>, and <var>url</var>.</p></li>
 
-           <li><p>Let <var>ruleSet</var> be the result of <span data-x="parse a speculation rule set
-           string">parsing a speculation rule set string</span> given <var>bodyText</var>,
-           <var>document</var>, and <var>response</var>'s <span
-           data-x="concept-response-url">URL</span>. If this throws an exception, then abort these
-           steps.</p></li>
+          <li><p><span data-x="list append">Append</span> <var>ruleSet</var> to
+          <var>document</var>'s <span data-x="document-sr-sets">speculation rule
+          sets</span>.</p></li>
 
-           <li><p><span data-x="list append">Append</span> <var>ruleSet</var> to
-           <var>document</var>'s <span data-x="document-sr-sets">speculation rule
-           sets</span>.</p></li>
-
-           <li><p><span>Consider speculative loads</span> for <var>document</var>.</p></li>
-          </ol>
-         </li>
+          <li><p><span>Consider speculative loads</span> for <var>document</var>.</p></li>
         </ol>
        </li>
       </ol>
@@ -113277,6 +113276,40 @@ document.querySelector("button").addEventListener("click", bound);
    pass it along as well.</p></li>
   </ol>
 
+  <p>To <dfn>fetch speculation rules</dfn>, given a <span>URL</span> <var>url</var> and
+  <code>Document</code> <var>document</var>, run these steps.
+
+  <ol>
+    <li><p>Let <var>request</var> be a new <span data-x="concept-request">request</span> whose <span
+    data-x="concept-request-url">URL</span> is <var>url</var>, <span
+    data-x="concept-request-client">client</span> is <var>document</var>'s <span>relevant settings
+    object</span>, <span data-x="concept-request-destination">destination</span> is "<code
+    data-x="">speculationrules</code>", and <span data-x="concept-request-mode">mode</span> is
+    "<code data-x="">cors</code>".</p></li>
+
+    <li>
+      <p><span data-x="concept-fetch">Fetch</span> <var>request</var> with the following <i
+      data-x="processResponseConsumeBody">processResponseConsumeBody</i> steps given <span
+      data-x="concept-response">response</span> <var>response</var> and null, failure, or a
+      <span>byte sequence</span> <var>bodyBytes</var>:</p>
+
+      <ol>
+        <li><p>If <var>bodyBytes</var> is null or failure, then return the empty string.</p></li>
+
+        <li><p>If <var>response</var>'s <span data-x="concept-response-status">status</span> is not
+        an <span>ok status</span>, then return the empty string.</p></li>
+
+        <li><p>If the result of <span data-x="extract a MIME type">extracting a MIME type</span>
+        from <var>response</var>'s <span data-x="concept-response-header-list">header list</span>
+        does not have an <span data-x="MIME type essence">essence</span> of
+        "<code>application/speculationrules+json</code>", then return the empty string.</p></li>
+
+        <li><p>Return the result of <span data-x="UTF-8 decode">UTF-8 decoding</span>
+        <var>bodyBytes</var>.</p></li>
+      </ol>
+    </li>
+  </ol>
+
   <h5 id="creating-scripts">Creating scripts</h5>
 
   <p>To <dfn data-x="creating a classic script">create a classic script</dfn>, given a

From 0f1c4735cd432e3ccf79713337ec96f0e6bf6d42 Mon Sep 17 00:00:00 2001
From: Viktoria Zlatinova <vizlatin@microsoft.com>
Date: Wed, 24 Sep 2025 14:33:30 -0700
Subject: [PATCH 2/2] remove async attribute

---
 source | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source b/source
index 84c0fceefe7..1ca63722011 100644
--- a/source
+++ b/source
@@ -63879,7 +63879,7 @@ interface <dfn interface>HTMLScriptElement</dfn> : <span>HTMLElement</span> {
     <tr>
      <th>External speculation rules</th>
      <td class="no">&middot;</td>
-     <td class="yes">Yes</td>
+     <td class="no">&middot;</td>
      <td class="no">&middot;</td>
      <td class="no">&middot;</td>
      <td class="yes">Yes</td>