jsFiddle is a great webapp that lets you edit HTML, JavaScript, CSS just like a normal IDE like Dreamweaver would do, all the syntax highlighting. The screen gets divided into 4 sections: HTML, CSS, Javascript and Result (Preview) as show below:
You can also add resources, an Ajax echo backend, and auto load from a slew of JavaScript frameworks. It also includes some built-in examples that you can use to see the great stuff such as Processing in action.
Lot of hard and good work has been put into the project using CodeMirror and MooTools. Kudos!
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