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diff --git a/layout/reftests/details-summary/dynamic-add-first-summary.html b/layout/reftests/details-summary/dynamic-add-first-summary.html
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+++ b/layout/reftests/details-summary/dynamic-add-first-summary.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html class="reftest-wait">
+ <script>
+ function runTest() {
+ // Insert a <summary> as the first child of the <details>.
+ var summary = document.createElement("summary");
+ var text = document.createTextNode("Summary");
+ summary.appendChild(text);
+
+ var details = document.getElementById("details");
+ details.insertBefore(summary, details.children[0]);
+
+ document.documentElement.removeAttribute("class");
+ }
+ </script>
+ <body onload="runTest();">
+ <details open id="details">
+ <summary>Second Summary</summary>
+ <p>This is the details.</p>
+ </details>
+ </body>
+</html>