LayoutTests/editing/execCommand/insert-list-with-id.html

<div id="description">This test makes sure InsertOrderedList ignores the third argument passed to execCommand and does not add an id attribute to the inserted list.</div>
<div id="test" contenteditable="true">list item</div>

<script>
if (window.layoutTestController)
    window.layoutTestController.dumpAsText();
var s = window.getSelection();
var div = document.getElementById("test");
var id = "foo";
s.setPosition(div, 0);
document.execCommand("InsertOrderedList", false, id);

expected = "<ol><li>list item</li></ol>";
actual = div.innerHTML;

output = document.getElementById("description").innerText + "\n\n";

if (expected == actual)
    output += "Success";
else
    output += "Failure.  Expected: " + expected + ", found: " + actual;
    
document.body.innerText = output;
</script>