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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...
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.
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.