LayoutTests/editing/deleting/whitespace-pre-1.html

<script src="../../resources/dump-as-markup.js"></script>
<p id="description">This tests for a bug in endOfLine.</p>

<div id="test" contenteditable="true" style="white-space:pre;">You should not see this paragraph unless the command has been undone.
There should be three paragraphs in this editable region.
The first one should be empty.</div>

<script>
function runTestsOn(platform) {
    var e = document.getElementById("test");
    var s = window.getSelection();

    if (window.internals)
        internals.settings.setEditingBehavior(platform);

    s.setPosition(e, 0);
    s.modify("extend", "forward", "lineBoundary");
    document.execCommand("Delete");
    Markup.dump("test", "on " + platform);
    document.execCommand("undo");
    Markup.dump("test", "after undo on " + platform);
}

if (window.testRunner)
    testRunner.dumpEditingCallbacks();
Markup.description(description.textContent);
Markup.dump("test", "initial state");
runTestsOn("mac");
runTestsOn("windows");
runTestsOn("unix");
</script>