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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script>
// If document.open's behavior is modified to remove the url-rewriting behavior,
// then this test can be deleted (https://github.com/whatwg/html/issues/3989).
setup({ explicit_done: true });
window.start = childDocument => {
const grandchildDocument =
childDocument.querySelector('iframe').contentDocument;
test(t => {
// Clean up the iframe so that the dangling document.open() doesn't cause a
// harness timeout.
t.add_cleanup(() => {
document.querySelector('iframe').remove();
});
assert_equals(childDocument.URL, 'about:srcdoc',
'Child document starting URL');
assert_equals(grandchildDocument.URL, 'about:blank',
'Grandchild document starting URL');
const originalChildBaseURL = childDocument.baseURI;
grandchildDocument.open("", "");
// Verify that the document.open() trick worked: the grandchild should now
// have the same url as the child, and have inherited the child's base url.
assert_equals(grandchildDocument.URL, 'about:srcdoc',
'Grandchild document after document.open() trick');
assert_equals(grandchildDocument.baseURI, originalChildBaseURL,
'Grandchild base URL must match child base URL');
// Give child a new base URL.
const baseElement = childDocument.createElement('base');
baseElement.href = get_host_info().REMOTE_ORIGIN;
childDocument.head.append(baseElement);
// Verify that changing the child's base url succeeded and did not affect
// the grandchild's base url.
const newChildBaseURL = childDocument.baseURI;
assert_equals(grandchildDocument.URL, 'about:srcdoc',
'Grandchild document after child gets new base URL');
assert_not_equals(newChildBaseURL, originalChildBaseURL,
'Child base URL must change');
assert_equals(grandchildDocument.baseURI, originalChildBaseURL,
'Grandchild base URL must not change');
});
done();
};
</script>
<iframe srcdoc="<iframe></iframe><script>parent.start(document)</script>">
</iframe>
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