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These images show some of the demos I produced for a course on web technologies. The aim was to illustrate what can be done with relatively simple JavaScript programs. I've since used a multi-trace modification of the oscilloscope code to help explain common keying and transmission schemes in a communications course -- included Ethernet, DSL, etc.
Yes, some of these are a little crazy... Getting a browser to render JavaScript animated 3D graphics with hidden surface removal was fun although for some reason browsers tended to warn about the amount of JavaScript processing they were doing. The examples were all pure JavaScript with no browser plug-ins and pre-date the inclusion of canvas support in browsers -- have a look at the simple Defender like game below to see how easy it is.