From 521261489000e8fb83178066af8705583abf534a Mon Sep 17 00:00:00 2001
From: Brian Birtles <birtles@gmail.com>
Date: Fri, 25 Oct 2024 11:04:09 +0900
Subject: [PATCH] [web-animations-1] Require a style flush at the end of
 commitStyles

Fixes #11084.
---
 web-animations-1/Overview.bs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/web-animations-1/Overview.bs b/web-animations-1/Overview.bs
index 6539775cf95..18e631af773 100644
--- a/web-animations-1/Overview.bs
+++ b/web-animations-1/Overview.bs
@@ -4877,6 +4877,22 @@ The {{Animation}} interface {#the-animation-interface}
       calling this method <em>does</em> trigger a [=style change event=]
       (see [[#model-liveness]]).
 
+      Furthermore,
+      after updating the style attribute of each effect target,
+      the user agent must ensure that the corresponding computed style
+      is updated.
+
+      <div class=note>
+
+        Without the requirement to update the computed style
+        at the end of the procedure,
+        calling `commitStyles` followed by immediately canceling an animation
+        could cause a transition to be generated since the changes to the
+        style attributes would not be reflected in the
+        [=before-change style=] during the next [=style change event=].
+
+      </div>
+
       <div class=note>
 
         Since the procedure to [=commit computed styles=]