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chromium/third_party/blink/web_tests/editing/inserting/insert_div_before_br_at_end.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
test(() => assert_selection(
    '<div contenteditable>one\u{00A0}|<br></div>',
    'insertHTML two<div>three</div>',
    '<div contenteditable>one two<div>three|</div></div>'),
    'insert DIV before BR at end');
</script>