title: ie11 : input with numbers only
body: <p>I need my input to accept only numbers.
  I have : </p>
  
  <pre><code>&lt;input type="number" pattern="[0-9]*" /&gt;
  </code></pre>
  
  <p>It works if I start typing letters, input will be emptied when it lost focus, but if I type "2blah" it will not be emptied.
  Any tips?</p>