title: Backspace not working in Firefox in input field
body: <p>I have this input filed with an onkeypress event:</p>
  
  <pre><code>&lt;input type="number" min = "0" id = "count" onkeypress='return event.charCode &gt;= 48 &amp;&amp; event.charCode &lt;= 57' /&gt; 
  </code></pre>
  
  <p>Basically this allows only numeric values to be entered into the field...and this works just fine... in Chrome, Firefox and IE.. which is enough for me. BUT the "backspace" key does not work in Firefox. It works fine in Chrome and IE. What I mean is if I want to type '15' and by accident I type '155'... when in Firefox I am not able to use "backspace" on that field. How can I make backspace work in Firefox?</p>