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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async_test(t => {
let i = document.createElement('iframe');
i.sandbox = "allow-same-origin allow-popups allow-popups-to-escape-sandbox";
i.srcdoc = `<a target='_blank' rel='opener'
href="javascript:window.opener.top.postMessage('FAIL', '*');">Click me!</a>
<a target='_blank' rel='opener'
href="./resources/post-done-to-opener.html">Click me next!</a>`;
i.onload = _ => {
// Since the frame is sandboxed, but allow-same-origin, we can reach into it to grab the
// anchor element to click. We'll click the `javascript:` URL first, then pop up a new
// window that posts `DONE`.
//
// TODO(mkwst): This feels like a race, but it's one that we consistently win when I'm
// running the test locally 10,000 times. Good enough!™
i.contentDocument.body.querySelectorAll('a')[0].click();
i.contentDocument.body.querySelectorAll('a')[1].click();
};
document.body.appendChild(i);
window.addEventListener('message', t.step_func(e => {
assert_not_equals(e.data, "FAIL");
if (e.data == "DONE")
t.done();
}));
}, "Sandboxed => unsandboxed popup");
</script>
</body>