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diff --git a/dom/base/crashtests/1681729.html b/dom/base/crashtests/1681729.html
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+++ b/dom/base/crashtests/1681729.html
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+<html class="reftest-wait">
+<head>
+<script>
+ async function test() {
+ // We need to go through the event loop first, so we're running this from
+ // a timeout set from the load event. If we were adding a load from the load
+ // event directly we'd just replace the iframe's session history entry
+ // instead of cloning it (and replacing its children).
+ let frame = document.getElementById("frame");
+
+ let p = new Promise((r) => {
+ frame.addEventListener("load", r, { once: true });
+ });
+ frame.src = "1681729-inner2.html";
+ await p;
+
+ p = new Promise((r) => {
+ frame.contentWindow.addEventListener("pageshow", r, { once: true });
+ });
+ history.back();
+ await p;
+
+ document.documentElement.removeAttribute("class");
+ }
+</script>
+</head>
+<body onload="setTimeout(test, 0);">
+<iframe id="frame" src="1681729-inner1.html"></iframe>
+</body>
+</html>