chromium/third_party/blink/web_tests/editing/undo/undo-deleteWord.html

<html> 
<head>

<style>
.editing { 
    border: 2px solid red; 
}
.explanation { 
    border: 2px solid blue; 
    padding: 12px; 
    font-size: 24px; 
    margin-bottom: 24px;
}
.scenario { margin-bottom: 16px;}
.scenario:first-line { font-weight: bold; margin-bottom: 16px;}
</style>
<script src=../editing.js language="JavaScript" type="text/JavaScript" ></script>

<script>

function sendDeleteWordKey()
{
    var deleteWordModifiers;
    if (navigator.userAgent.search(/\bMac OS X\b/) != -1)
        deleteWordModifiers = ["altKey"];
    else
        deleteWordModifiers = ["ctrlKey"];

    if (window.eventSender)
        eventSender.keyDown("Backspace", deleteWordModifiers);
    window.setTimeout(undoNow, 100);
}

function undoNow()
{
    document.execCommand("Undo");

    if (window.testRunner)
        testRunner.notifyDone();
}

function editingTest() {
    typeCharacterCommand('o');
    typeCharacterCommand('n');
    typeCharacterCommand('e');
    typeCharacterCommand(' ');
    typeCharacterCommand('t');
    typeCharacterCommand('w');
    typeCharacterCommand('o');
    typeCharacterCommand(' ');
    typeCharacterCommand('t');
    typeCharacterCommand('h');
    typeCharacterCommand('r');
    typeCharacterCommand('e');
    typeCharacterCommand('e');
    typeCharacterCommand(' ');
    typeCharacterCommand('f');
    typeCharacterCommand('o');
    typeCharacterCommand('u');
    typeCharacterCommand('r');

    window.setTimeout(sendDeleteWordKey, 100);
}

</script>

<title>Editing Test</title> 
</head> 
<body>

<div class="explanation">
<div class="scenario">
Tests: 
<br>
Undo a delete word after a series of insertText does not wipe out the entire content.
</div>
</div>

<div contenteditable id="root">
<div id="test" class="editing"></div>
</div>

<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

var selection = window.getSelection();
selection.collapse(document.getElementById("test"), 0);
editingTest();
</script>

</body>
</html>