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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigate_itself.html 

<!doctype html>
<meta charset="utf-8">
<title>Check that sandboxed iframe can navigate itself</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  var t = async_test();
  onmessage = t.step_func_done(function(e) {
    assert_equals(e.data, "can navigate", "Should have the right message");
  });
</script>
<iframe sandbox="allow-scripts" src="support/iframe-trying-to-navigate-itself.html"></iframe>