chromium/src/third_party/blink/web_tests/editing/deleting/in-visibly-empty-root.html

<p>
    Test that a backward delete in an editable root that contains only a single
    visible position removes all children of the editable root.
</p>
<div id="editable-root" contenteditable>
    <div id="square" style="background-color: red; height: 100px; width: 100px;">Lorem ipsum dolor sit amet</div>
</div>
<div id="result"></div>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    var root = document.getElementById("editable-root");
    var square = document.getElementById("square");
    root.focus();
    document.execCommand("SelectAll");
    document.execCommand("delete", "backward");
    if (!square.parentNode)
        document.getElementById("result").innerText = "FAIL: first delete removed the container";
    else {
        document.execCommand("delete", "backward");
        document.getElementById("result").innerText = square.parentNode ? "FAIL: second delete did not remove the container" : "PASS";
    }
</script>