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chromium/third_party/blink/web_tests/editing/inserting/insert-3800346-fix.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote>|<br></div>',
        '</div>',
    ],
    'InsertLineBreak',
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote><br>|<br></div>',
        '</div>',
    ]);
selection_test(
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote><br>|<br></div>',
        '</div>',
    ],
    'InsertLineBreak',
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote><br><br>|<br></div>',
        '</div>',
    ]);
selection_test(
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote><br><br>|<br></div>',
        '</div>',
    ],
    'InsertLineBreak',
    [
        '<div contenteditable>',
            '<div>ab<blockquote>cd</blockquote><br><br><br>|<br></div>',
        '</div>',
    ]);
</script>