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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Iframe focus event inner document</title>
</head>
<body>
<h1>Inner</h1>
<script>
let innerlog = "innerlog:";
window.onmessage = function(e) {
if (e.data == "windowfocus") {
innerlog += "willfocuswindow,";
window.focus();
innerlog += "didfocuswindow,";
} else if (e.data == "getlog") {
parent.postMessage(innerlog, "*");
}
};
window.onfocus = function() {
innerlog += "windowfocus,";
};
window.onblur = function() {
innerlog += "windowblur,";
};
</script>
</body>
</html>