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chromium/third_party/blink/web_tests/fast/forms/number/number-lossless-localization.html 

<!DOCTYPE html>
<body>
<script src="../../../resources/js-test.js"></script>
<input type="number" id="number1">
<script>
var numberInput = document.getElementById('number1');
numberInput.focus();
// Note that this test doesn't work in a locale in which people don't use 0-9
// for numbers.
document.execCommand('inserttext', false, '0000123456789012345678901234567890123456789');
numberInput.blur();
shouldBeEqualToString('numberInput.value', '0000123456789012345678901234567890123456789');
</script>
</body>