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chromium/third_party/blink/web_tests/external/wpt/focus/support/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back-outer.sub.html 

<!doctype html>
<meta charset="utf-8">
<title>activeElement when focusing different-site iframe then immediately focusing back outer</title>
<input type="text">
<iframe src="http://{{hosts[alt][www]}}:{{ports[http][0]}}/focus/support/focus-event-after-focusing-iframes-inner.html"></iframe>
<script>
let outerlog = "outerlog:";

let iframe = document.querySelector("iframe");
let input = document.querySelector("input");
window.onmessage = function(e) {
  if (e.data == "focus") {
    outerlog += "willfocusiframe,";
    iframe.focus();
    outerlog += "didfocusiframe,";
    outerlog += "willfocusinput,";
    input.focus();
    outerlog += "didfocusinput,";
  } else if (e.data == "getlog") {
    iframe.contentWindow.postMessage("getlog", "*");
  } else if (e.data == "getActiveElement") {
    opener.postMessage(document.activeElement.tagName, "*");
  } else {
    opener.postMessage(outerlog + e.data, "*");
  }
};

window.onload = function() {
  input.onfocus = function() {
    outerlog += "inputfocus,";
  };

  input.onblur = function() {
    outerlog += "inputblur,";
  };

  opener.postMessage("ready", "*");
};
</script>