<!DOCTYPE html>
<meta charset="utf-8">
<title>Sandboxing: Retrieving display availability from a nested context succeeds when allow-presentation is set</title>
<link rel="author" title="Francois Daoust" href="https://www.w3.org/People/#fd">
<link rel="help" href="http://w3c.github.io/presentation-api/#dom-presentationrequest-getavailability">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
    async_test(function (t) {
        function startWhenReady(ev) {
            var childFrame = document.getElementById('childFrame');
            if (ev.data === 'ready') {
                window.removeEventListener('message', startWhenReady);
                childFrame.contentWindow.postMessage('getAvailability', '*');
                window.addEventListener('message', t.step_func(function (ev) {
                    assert_equals(ev.data, 'success',
                        'Presentation sandboxing did not work as expected.');
                    t.done();
                }));
            }
        }
        window.addEventListener('message', startWhenReady);
    });
</script>
<iframe id="childFrame" sandbox="allow-scripts allow-presentation" style="display:none" src="support/iframe.html"></iframe>