qooxdoo event layer. In a standard qooxdoo application these are the events   you have to deal with.     The classes in this namespace provide a cross browser event layer. It   normalizes not only the registration API but also event behavior.  The event   layer is able to support features in all supported browsers, which are   normally only available in some of them.     The following features are supported in a browser-independent way:   <ul>     <li>Canceling of events <code>stopPropagation<code><li>     <li>Prevention of the browser's default behavior <code>preventDefault<code>     <li>Unified event objects matching the DOM 2 event interface (<a href="http:www.w3.orgTRDOM-Level-2-Eventsevents.html#Events-interface">Reference<a>)<li>     <li>Support for the event <i>bubbling<i> and <i>capturing<i> phase<li>     <li>Support for mouse event capturing (<a href="http:msdn2.microsoft.comen-uslibraryms537630.aspx">Reference<a>)<li>     <li>Support for normalized focus and activation handling<li>   <ul>     The central class is {@link qx.event.Registration} which provides the event   registration and de-registration functionality.