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chromium
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chromium/third_party/blink/web_tests/editing/input/textarea-white-space-normal-trailing-space-expected.html 

<!DOCTYPE html>
<textarea style="white-space:pre-wrap">a b </textarea>
<script>
var textarea = document.querySelector('textarea');
textarea.focus();
textarea.selectionStart = 4;
textarea.selectionEnd = 4;
</script>