testing/web-platform/tests/focus/support/iframe-contentwindow-focus-with-same-as-top-intermediate-frame-inner.html


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<!DOCTYPE html>
<html>
<head>
    <title>iframe.contentWindow.focus() with same-as-top intermediate frame inner</title>
</head>
<body>
<script>
document.body.onfocus = function() {
    parent.postMessage("innerfocus;", "*");
}
</script>
</body>
</html>