HtmlButton handler fires twice when clicked (when AutoEventWireup="True")
<p>I have an html button, see below. When it's clicked and AutoEventWireup="true", the Save_Click click handler is fired twice. When AutoEventWireup="False", it fires once. </p>

<p>Why is it firing twice? The button is not registered twice and no code which is adding the event handler. Using master page and no Ajax.</p>

<pre><code>&lt;button id="Save" accesskey="v" type="submit" runat="server" onserverclick="Save_Click"&gt;&lt;/button&gt;
</code></pre>
