third_party/WebKit/LayoutTests/editing/pasteboard/merge-start-list.html

<script>
if (window.testRunner)
     testRunner.dumpEditingCallbacks();
</script>
<p>This test makes sure that content inside a list in an incoming fragment isn't pulled out of the list during paste.</p>
<p><b>You should see 'bar' inside a list item.</b></p>

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

<script>
var s = window.getSelection();
var e = document.getElementById("test");

s.collapse(e, 0);

document.execCommand("InsertHTML", false , "<ul><li>bar</li></ul>");
</script>