From 44f2958fa50514f4cd83bfca07311fc111b8a436 Mon Sep 17 00:00:00 2001
From: Shannon Booth <shannon.ml.booth@gmail.com>
Date: Wed, 3 Jun 2026 22:10:46 +0200
Subject: [PATCH] Don't update active document too early for same-origin
 navigations

The active document was previously derived from the active window's
associated Document, which changes during create-and-initialize for
an initial about:blank same-origin navigation before the new document
is made active. By making active document a variable of browsing context
only set by the make active algorithm, this allows the document to be
updated at the right time.
---
 source | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/source b/source
index 313ebb8e783..c885855a5d0 100644
--- a/source
+++ b/source
@@ -105285,6 +105285,8 @@ interface <dfn interface>NotRestoredReasons</dfn> {
   context</span> has a corresponding <code>WindowProxy</code> object, as well as the following:</p>
 
   <ul>
+   <li><p>An <dfn>active document</dfn>, a <code>Document</code>.</p></li>
+
    <li><p>An <dfn export>opener browsing context</dfn>, a <span>browsing context</span> or null,
    initially null.</p></li>
 
@@ -105313,9 +105315,7 @@ interface <dfn interface>NotRestoredReasons</dfn> {
 
   <div algorithm>
   <p>A <span>browsing context</span>'s <dfn>active window</dfn> is its <code>WindowProxy</code>
-  object's <span data-x="concept-windowproxy-window">[[Window]]</span> internal slot value. A
-  <span>browsing context</span>'s <dfn>active document</dfn> is its <span>active window</span>'s
-  <span data-x="concept-document-window">associated <code>Document</code></span>.</p>
+  object's <span data-x="concept-windowproxy-window">[[Window]]</span> internal slot value.</p>
   </div>
 
   <div algorithm>
@@ -111609,6 +111609,9 @@ location.href = '#foo';</code></pre>
    <li><p>Let <var>window</var> be <var>document</var>'s <span>relevant global
    object</span>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-bc">browsing context</span>'s
+   <span>active document</span> to <var>document</var>.</p></li>
+
    <li><p>Set <var>document</var>'s <span data-x="concept-document-bc">browsing context</span>'s
    <code>WindowProxy</code>'s <span data-x="concept-windowproxy-window">[[Window]]</span> internal
    slot value to <var>window</var>.</p></li>