I want to know which sites can give me information on the list of JavaScript functions that are supported by IE/Firefox/Opera/Safari.
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possible duplicate of http://stackoverflow.com/questions/63918/what-is-the-best-online-javascript-css-html-xhtml-dom-reference – Pekka Apr 09 '10 at 09:28
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Perhaps not a direct answer to this question, but never-the-less I think this is useful to know about: You can use the Sputnik JavaScript Conformance tool in Google Labs to check ECMAScript conformance in browsers:
Sputnik is a JavaScript conformance test suite containing over 5000 tests. It tests how well a JavaScript implementation adheres to the ECMA-262 specification version 5, looking only at those features that were also present in the previous version, version 3, and not the new features added in version 5.

Dan Diplo
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There are several sites for that but you'll probably find that none are absolutely complete, so it is worth checking out each of them
- quirksmode.org compatibility tables
- sitepoint JS reference (work in progress)
- Mozilla MDC reference (mozilla only but worth mentioning)

ChrisR
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