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chromium/third_party/blink/web_tests/external/wpt/html/rendering/widgets/input-number-text-size-ref.html 

<!DOCTYPE html>
<input type=number><br>
<input type=number><br>
<input type=number><br>
<input type=number size=10><br>
<input type=number><br>
<input type=number size=1><br>
<input type=number size=2><br>
<input type=number size=3><br>
<input type=number size=4><br>