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<!DOCTYPE html>
<meta charset="utf-8">
<title>beforeunload event is emitted synchronously</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/webappapis.html#the-event-handler-processing-algorithm">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
'use strict';
// "navigate a browsing context" synchronously calls "prompt to unload", which
// synchronously calls "dispatch an event".
async_test(function(t) {
var iframe = document.createElement('iframe');
iframe.onload = t.step_func(function() {
var callCount = 0;
iframe.contentWindow.onbeforeunload = function() {
callCount += 1;
};
iframe.contentWindow.location.href = '/common/blank.html';
assert_equals(callCount, 1, 'invoked synchronously exactly once');
t.done();
});
document.body.appendChild(iframe);
});
</script>
</body>
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