beforeunload-synchronous.html

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/unloading-documents/beforeunload-synchronous.html - WPT Dashboard Interop Dashboard

<!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>