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The above block of code demonstrates an in-browser, syntax-highlighting, auto-indenting JavaScript editor. Use ctrl-i or ctrl-space (depending on which one your browser interferes with) to re-indent the current line. Known issues are...
These bookmarklets let you see how a web page is coded without digging through the source, debug problems in web pages quickly, and experiment with CSS or JS without editing the actual page.
syntax highlighting of code snippets in a web page A Javascript module and CSS file that allows syntax highlighting of source code snippets in an html page.