title: <input type="number"> not working in IE10
body: <p>Although I'm pretty sure this was working yesterday or the day before, <code>&lt;input type="number" min="0" max="50" step="10" value="0" /&gt;</code>, for example, no longer works in IE10.  I've tested my browser with <a href="http://ie.microsoft.com/testdrive/HTML5/Forms/Default.html">http://ie.microsoft.com/testdrive/HTML5/Forms/Default.html</a> and it's just not working anymore.  Anyone else having this issue?  Or, did it never work?</p>