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<!DOCTYPE HTML>
<html>
<head>
<title>Test for multiple submissions in straightline code</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script>
add_task(async function double_submit() {
dump("test start\n");
let popup = window.open("file_double_submit.html");
await new Promise(resolve => {
popup.addEventListener("load", resolve, {once: true})
});
let numCalls = 0;
popup.addEventListener("beforeunload", () => {
numCalls++;
info("beforeunload called " + numCalls + " times");
});
info("clicking button");
popup.document.querySelector("button").click();
is(numCalls, 1, "beforeunload should only fire once");
popup.close();
});
</script>
</body>
</html>
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