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diff --git a/layout/style/crashtests/1616407.html b/layout/style/crashtests/1616407.html
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+<script>
+ async function start() {
+ var a = new CSSStyleSheet({ })
+ document.adoptedStyleSheets = [new CSSStyleSheet({ }), a, a]
+ }
+ document.addEventListener('DOMContentLoaded', start)
+ </script>