Hmm. Just tried all three(i.e aspx.:

<input type="button" id="button1" value="One" />
<button type="button" id="button2">Two</button>
<asp:Button runat="server" ID="button3" Text="Three"/>

gives HTML:

<input type="button" id="button1" value="One">
<button type="button" id="button3">Two</button>
<input type="submit" name="button4" value="Three" id="button4">

in a clean Web Application and they look the same to me. Relevant bit in css:

   input[type="submit"],
    input[type="button"],
    button {
        background-color: #d3dce0;
        border: 1px solid #787878;
        cursor: pointer;
        font-size: 1.2em;
        font-weight: 600;
        padding: 7px;
        margin-right: 8px;
        width: auto;
    }

How does yours differ ?




>Actually the html button and asp:button are not styled identically (by standard Site.css). The height of the button and asp:button are very different. Of course, this could be changed. I plan to do away with standard MS Site.css and have my own CSS (in addition to Bootstrap.css) since I don't like a lot of standard styles in Site.css
>
>>Absolutely - and, as per my post to Dmitry, if he is using the standard Site.css file for an ASP.NET Web Application then they are indeed styled identically.
>>
>>>You should be able to style them the same.
>>>
>>>>asp:Button (which must have "runat='server'") creates an input element with type="submit" (rather than "button" which was what I suggested)