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chromium/third_party/blink/web_tests/fast/multicol/textarea-as-multicol.html 

<!DOCTYPE html>
<p>Multicol should have no effect when specified on a TEXTAREA element.</p>
<p>The word 'PASS' should be seen inside the box:</p>
<textarea style="-webkit-columns:3; overflow:hidden; resize:none; width:6em; height:2em;">PASS</textarea>