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chromium/third_party/blink/web_tests/fast/forms/month/month-appearance-basic.html 

<html>
<body>
<ul>
    <li>basic <input type="month"> <input type="month" value="1982-11"></li>
    <li>focus <input type="month"> <input type="month" value="1982-11"></li>
    <li>disabled <input type="month" disabled> <input type="month" value="1982-11" disabled></li>
    <li>readonly <input type="month" readonly> <input type="month" value="1982-11" readonly></li>
    <li>RTL <input type="month" dir="rtl"> <input type="month" value="1982-11" dir="rtl"></li>
</ul>

<ul>
    <li>text-align: <input type="month" value="1982-11" style="text-align: left;"></li>
    <li>text-transform: <input type="month" value="1982-11" style="text-transform: lowercase;"></li>
    <li>background, color: <input type="month" value="1982-11" style="border: 0px; background: green; color: yellow;"></li>
    <li>font-size, font-weight: <input type="month" value="1982-11" style="font-size: 20pt; font-weight: bold;"></li>
    <li>font-size with fixed input width: <input type="month" value="1982-11" style="font-size: 20pt; width: 13em;"></li>
    <li>Fixed input height: <input type="month" value="1982-11" style="height: 4em;"></li>
    <li>-webkit-appearance:none: <input type="month" value="1982-11" style="-webkit-appearance: none;"></li>
    <li>padding: <input type="month" value="1982-11" style="padding: 20px"></li>
</ul>
<script>
document.querySelectorAll('input')[2].focus();
</script>
</body>
</html>