LayoutTests/editing/deleting/5300379.html

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

div = document.getElementById("div");
sel = window.getSelection();
sel.setPosition(div, 0);
if (window.testRunner) {
    // Test to see if deleteWordBackward: hangs.
    testRunner.execCommand("DeleteWordBackward");
    document.execCommand("InsertText", false, "Success FAIL");
    // Delete 'FAIL' with deleteWordBackward: to verify that it's not a no-op.
    testRunner.execCommand("DeleteWordBackward");
    testRunner.execCommand("DeleteBackward");
    document.execCommand("InsertText", false, "\nThis tests that deleting backward by word in an empty div doesn't hang, and that it deletes exactly one word. You should see 'Success' above.");
    window.testRunner.dumpAsText();
} else {
    document.execCommand("InsertText", false, "To run this test manually.  Delete all this text and then option-delete.  Safari shouldn't hang.");
}
</script>