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chromium/third_party/blink/web_tests/external/wpt/focus/support/activeelement-after-focusing-same-site-iframe-outer.html 

<!doctype html>
<meta charset="utf-8">
<title>activeElement when focusing same-site iframe</title>
<script>
let log = "";
function getLog() {
    return log;
}
window.onmessage = function(e) {
    log += e.data;
};
window.onload = function() {
    log += "outeronload,";
    log += "activeElement:" + document.activeElement.tagName + ",";
    log += "willfocusiframe,";
    document.getElementsByTagName("iframe")[0].focus();
    log += "didfocusiframe,";
    log += "activeElement:" + document.activeElement.tagName + ",";
    log += "willbluriframe,";
    document.getElementsByTagName("iframe")[0].blur();
    log += "didbluriframe,";
    log += "activeElement:" + document.activeElement.tagName + ",";
    log += "willspineventloop,"
    opener.step_timeout(function() {
        opener.postMessage(getLog(), "*");
    }, 1500);
}
</script>
<iframe src="activeelement-after-focusing-same-site-iframe-inner.html"></iframe>