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diff --git a/layout/style/crashtests/1453206.html b/layout/style/crashtests/1453206.html
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+++ b/layout/style/crashtests/1453206.html
@@ -0,0 +1,8 @@
+<!doctype html>
+<div id="host"></div>
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+ let shadow = host.attachShadow({ mode: 'open' });
+ shadow.appendChild(document.createElement('marquee'));
+});
+</script>