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chromium/third_party/blink/web_tests/external/wpt/focus/focus-already-focused-iframe-same-site.html 

<!doctype html>
<meta charset=utf-8>
<title>Focus already focused iframe</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
setup({explicit_done:true});
var w = null;
window.onload = function() {
  window.onmessage = function(e) {
      test(function() {
          assert_equals(e.data, "PASS", 'Check result');
      }, "Check result");
      w.close();
      w = null;
      done();
  };
  w = window.open("support/focus-already-focused-iframe-same-site-outer.html");
}
</script>