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diff --git a/dom/tests/browser/perfmetrics/ping_worker2.html b/dom/tests/browser/perfmetrics/ping_worker2.html
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+++ b/dom/tests/browser/perfmetrics/ping_worker2.html
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+<!DOCTYPE html>
+<html lang="en" dir="ltr">
+<head>
+ <meta charset="utf-8">
+ <script type="text/javascript">
+
+ var shared;
+
+ function init() {
+ shared = new SharedWorker("shared_worker.js");
+ shared.port.start();
+ for (let i = 0; i < 10; i++) shared.port.postMessage(["ok"]);
+ }
+
+ </script>
+</head>
+<body onload="init()">
+ <h1>A page with a shared worker</h1>
+</body>
+</html>