chromium/third_party/blink/web_tests/editing/deleting/delete-br-001.html

<body>
<div id="container">
<div contenteditable="true" id="work"></div>
</div>
</div>
<script src="../../resources/js-test.js"></script>
<script>
function $(id) { return document.getElementById(id); }

var sampleHTML = 'abc<br id="a"><br id="b"><br id="c">def';
var selection = window.getSelection();
function testIt(nth, numberOfDeletes, expectedOffset, expectedHTML) {
    $('work').innerHTML = sampleHTML;
    var range = document.createRange();
    range.setStartAfter($('work').querySelectorAll('br')[nth]);
    selection.removeAllRanges();
    selection.addRange(range);
    for (var i = 0; i < numberOfDeletes; ++i)
        document.execCommand('Delete');
    shouldBeEqualToString('$("work").innerHTML', expectedHTML);
    shouldBeEqualToString('selection.type', 'Caret');
    shouldBe('selection.anchorOffset', expectedOffset + '');
}

testIt(0, 1, 3, 'abc<br id="b"><br id="c">def');
testIt(1, 1, 2, 'abc<br id="a"><br id="c">def');
testIt(2, 1, 0, 'abc<br id="a"><br id="b">def');
testIt(1, 2, 3, 'abc<br id="c">def');
testIt(2, 2, 0, 'abc<br id="a">def');
testIt(2, 3, 3, 'abcdef');

if (window.testRunner)
    $('container').outerHTML = '';
else
    $('work').innerHTML = sampleHTML;
</script>
</body>