From 3427d29cc7fdeca704fc5d1992dfae41a5a96520 Mon Sep 17 00:00:00 2001
From: Simon Pieters <zcorpan@gmail.com>
Date: Thu, 16 Oct 2025 14:07:55 +0200
Subject: [PATCH] Check if there's a browsing context in window.open() steps

Fixes #11797.
---
 source | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source b/source
index c87286f397d..7b1642f4c97 100644
--- a/source
+++ b/source
@@ -95305,6 +95305,9 @@ dictionary <dfn dictionary>WindowPostMessageOptions</dfn> : <span>StructuredSeri
    <li><p>If the <span>event loop</span>'s <span>termination nesting level</span> is nonzero,
    then return null.</p></li>
 
+   <li><p>If the <span>entry global object</span>'s <span data-x="window bc">browsing
+   context</span> is null, then return null.</p></li>
+
    <li><p>Let <var>sourceDocument</var> be the <span>entry global object</span>'s <span
    data-x="concept-document-window">associated <code>Document</code></span>.</p></li>