LayoutTests/platform/mac/editing/input/bold-node.html

<meta charset="utf-8">
<body>
<p>Test for <a href="rdar://problem/6988023">rdar://problem/6988023</a>: Only the last Korean character can be shown if font style is enabled while typing.</p>
<div contenteditable id=div></div>
<script>
var div = document.getElementById("div");
div.focus();

if (window.testRunner) {
    testRunner.dumpAsText();

    textInputController.insertText("a");
    textInputController.doCommand("toggleBold:");
    textInputController.setMarkedText("b", 0, 1);
    div.innerHTML = (textInputController.hasMarkedText()) ? "PASS" : "FAIL";
} else {
    document.write("To test manually:<br>" + 
        "1. Type any character to the focused input field, then enable 2-Set Hangul input method.<br>" +
        "2. Press 'Command + B', 'Command + I' or 'Command + U'.<br>" +
        "3. Type any Korean characters (e.g. \"한글(gksrmf)\" ) after the character typed in Step 1, check the results.");
}
</script>
</body>