Is there a way to set default value of range input to be empty? : <p>I have a HTML5 range input</p>

<pre><code>&lt;input name="testing" type="range" min="0" max="10" step="1"&gt;
</code></pre>

<p>When there is no attribute "value" set, it sets the default value to the middle (i.e. 5 in this case). Is there a way to make it empty so that I know if the user has actively input something?</p>

<p>I have another div for value display. At the beginning the value will be "?", so the user will know they haven't input anything. The problem is to prevent the input from submitting value to backend if value is not actively set.</p>
