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<!DOCTYPE html>
<title>Controlled iframe with initial about:blank becomes sandboxed</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<body>
<script>
// This test creates an iframe controlled by a service worker, which in turn has
// another iframe in it. The inner iframe's fetch is intercepted by the service
// worker, which notifies the outer iframe, which then adds the sandbox
// attribute to the inner iframe. The outer iframe then signals the service
// worker that it should evaluate self.clients.matchAll() and finally respond to
// the inner iframe's fetch.
// Evaluating self.clients.matchAll() causes the creation of the initial
// about:blank document for the inner iframe, and if the sandboxing flags used
// for that document are not the original flags for the inner iframe (i.e. none)
// then the document will have an opaque origin, a case that we need to handle
// properly.
promise_test(async t => {
const URL = 'resources/bug1675097-sw.js';
const SCOPE = 'resources/';
const registration = await service_worker_unregister_and_register(t, URL, SCOPE);
t.add_cleanup(() => registration.unregister());
await wait_for_state(t, registration.installing, 'activated');
const outer = await with_iframe(SCOPE + 'bug1675097-iframe.html');
t.add_cleanup(() => outer.remove());
}, 'Regression test for bug 1675097');
</script>
</body>
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