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chromium/third_party/blink/web_tests/editing/deleting/delete-surrogatepair.html 

<html>
<head>
<style>
.editing {
    border: 2px solid red;
    padding: 12px;
    font-size: 24px;
}
</style>
<script src="../editing.js"></script>
<title>Delete Backward</title>
</head>

<body>

<p>This test makes sure that a surrogate-pair character is deleted by one pressing delete key</p>
<div contenteditable id="root0" class="editing">hogehoge</div>
<div contenteditable id="root1" class="editing">&#x2003E;hogehoge</div>
<div contenteditable id="root2" class="editing">a&#x2003E;</div>
<div contenteditable id="root3" class="editing">a&#x2003E;</div>
<div contenteditable id="root4" class="editing">&#x2003E;a</div>
<div contenteditable id="root5" class="editing">&#x2003E;a</div>
<div contenteditable id="root6" class="editing">a&#x2003E;a</div>
<div contenteditable id="root7" class="editing">a&#x2003E;a</div>
<div contenteditable id="root8" class="editing">a&#x2003E;a</div>
<div contenteditable id="root9" class="editing">a&#x2003E;&#x2003E;a</div>
<div contenteditable id="root10" class="editing">a&#x2003E;&#x2003E;a</div>

<script>
if (window.testRunner) {
    var pos = [4, 1, 1, 2, 1, 2, 1, 2, 3, 2, 3];
    for (var i = 0; i < 11; ++i) {
        var div = document.getElementById("root" + i);

        div.focus();
        for (var j = 0; j < pos[i]; ++j)
            testRunner.execCommand("MoveForward");

        testRunner.execCommand("DeleteBackward");
    }

    testRunner.dumpAsText();
} else {
    document.write("This test requires testRunner.<br>");
    document.write("When doing manually, try to delete the above strings by hitting backspace key.");
}

</script>

</body>
</html>