The SwingJS directory is the primary directory for the SwingJS project. It contains a substantial number of files, most of which were created by hand and all of which have very specific JavaScript/HTML5-only "native" code references. They provide all of the interfaces to window.J2S and related page JavaScript that creates and manages an embedded JApplet or a Java application being run from main().

These classes should never be referenced by a Java project directly outside of the jsjava, jsjavax, or jssun packages. They are not intended to ever be run in Java, only in JavaScript.

Specific packages in swingjs include:

Directory	Description
swingjs/api	Interfaces for referring to these classes without referencing them directly. Also includes interfaces to all calls from this code to actual JavaScript functions. For example, DOMNode is an abstract class that represents an HTML5 element DOM node constructed but not necessarily on the page itself. Similarly, HTML5AudioContext and HTML5CanvasContext2D allow calls that look like (and most importantly are searchable in Eclipse as) Java calls to actually get information directly from a page Audio or Canvas.
swingjs/jquery	jQuery and jQueryUI files for JMenu and JSlider.
swingjs/jzlib	ZIP-file related classes from org.jcraft.zlib specially adapted for JavaScript handling.
swingjs/plaf	The key GUI classes for implementing Swing components in HTML5. All the magic happens here.