 <ol> <li><p>Make sure it works fine in Opera Mobile. (Download the Mobile emulator from here - <a href="http://www.opera.com/developer/tools/" rel="nofollow">http://www.opera.com/developer/tools/</a>)</p></li> <li><p>Understand <a href="http://dev.opera.com/articles/view/opera-binary-markup-language/" rel="nofollow">OBML</a> to get an idea of what javascript will / won't work. </p></li> <li>The OBML article is a little old, so also read the <a href="http://www.opera.com/docs/specs/productspecs/" rel="nofollow">Web specifications support in Opera products</a>.</li> <li>You can then decide how your web app can degrade gracefully for Opera Mini (if at all it needs to).</li> </ol>