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chromium/third_party/blink/web_tests/editing/style/block-styles-007.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// Fix for this bug: rdar://problem/3977962 font loses bold style after pasting
// next to existing text and pressing return.
selection_test(
    '<div contenteditable><div>foo<b>|bar</b></div></div>',
    'insertParagraph',
    '<div contenteditable><div>foo</div><div><b>|bar</b></div></div>');
</script>