<!DOCTYPE html>
<html>
<body>
<blockquote>
    <div>
        <span id="span">
            <i id="i1">a</i>
            <i id="i2">b</i>
        </span>
    </div>
    <div>1</div>
</blockquote>
</body>

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document.designMode = "on";
document.execCommand("SelectAll");

let frame = document.body.appendChild(document.createElement("iframe"));
frame.contentWindow.matchMedia("(max-width: 100px)").addListener(listener);

document.execCommand("Outdent");
document.body.innerHTML = "<code style='color: green'>PASS</code>";
</script>
</html>