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diff --git a/layout/reftests/first-letter/dynamic-4.html b/layout/reftests/first-letter/dynamic-4.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+ <style>
+ span.x { color: green; }
+ div::first-letter { font-size: 100px; }
+ </style>
+ <div style="color: red">
+ <span>X</span>
+ </div>
+ <script>
+ addEventListener("load", function() {
+ // Make sure we do our class change after we've done our next restyle, so we
+ // won't get a spurious restyle hiding the problem we're testing.
+ requestAnimationFrame(() => {
+ requestAnimationFrame(() => {
+ var s = document.querySelector("span");
+ s.className = 'x'
+ document.documentElement.className = "";
+ });
+ });
+ });
+ </script>
+</html>