title: onchange event on input type=range is not triggering in Firefox while dragging
body: <p>When I played with <code>&lt;input type="range"&gt;</code>, Firefox triggers an onchange event only if we drop the slider to a new position where Chrome and others triggers onchange events while the slider is dragged.</p>
  
  <p>How can I make it happen on dragging in Firefox?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>function showVal(newVal){
      document.getElementById("valBox").innerHTML=newVal;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;span id="valBox"&gt;&lt;/span&gt;
  &lt;input type="range" min="5" max="10" step="1" onchange="showVal(this.value)"&gt;</code></pre>
  </div>
  </div>
  </p>