<div></div>
<div contenteditable="true" id="div"></div>
<div></div>

<script>
div = document.getElementById("div");
sel = window.getSelection();
sel.setPosition(div, 0);
if (window.layoutTestController) {
    // Test to see if deleteWordBackward: hangs.
    layoutTestController.execCommand("DeleteWordBackward");
    document.execCommand("InsertText", false, "Success FAIL");
    // Delete 'FAIL' with deleteWordBackward: to verify that it's not a no-op.
    layoutTestController.execCommand("DeleteWordBackward");
    layoutTestController.execCommand("DeleteBackward");
} else {
    document.execCommand("InsertText", false, "To run this test manually.  Delete all this text and then option-delete.  Safari shouldn't hang.");
}
</script>