LayoutTests/editing/deleting/6026335.html

<div id="description">This tests deleting a selection that starts at the beginning of an editable pocket inside a non-editable table. The caret should not disappear during the delete and should be placed inside the editable span. When text is then inserted, it should be placed inside that span.</div>
<div id="edit" contentEditable="true">
<div contentEditable="false"><span>&nbsp;</span><span contentEditable="true" id="start">Hello</span></div>
<div id="end"><br></div>
</div>

<script>
if (window.testRunner)
    window.testRunner.dumpAsText();
start = document.getElementById("start");
end = document.getElementById("end");
s = window.getSelection();
s.setBaseAndExtent(start, 0, end, 0);
document.execCommand("Delete");
document.execCommand("InsertText", false, "Text");
if (window.testRunner)
    document.body.innerText = document.getElementById("description").innerText + "\n" + document.getElementById("edit").innerHTML;
</script>