chromium/third_party/blink/web_tests/editing/inserting/insert-div-022.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>',
            '<p id="test"><b>foo|</b><br>bar</p>',
        '</div>',
    ].join(''),
    selection => {
        selection.document.execCommand('insertParagraph');
        selection.document.execCommand('insertText', false, 'x');
    },
    [
        '<div contenteditable>',
            '<p id="test"><b>foo</b></p>',
            '<p id="test"><b>x|<br></b>bar</p>',
        '</div>',
    ].join('')),
    'Insert "x" before BR, since insertParagraph puts caret before BR');
</script>