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“This article describes a set-based model for explicit extensibility and understanding extensions that maximize the versioning capabilities of any language, including languages defined by XML Schema or other XML vocabulary formalisms”
 
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These error codes pop up from time to time while doing XHR requests in IE.
 
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Issues arising from Firefox’s XHR implementation reporting 304 status codes as 200s which some argue is the right thing to do.
 
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Good summary from Crockford on JSON and browser security issues.
 
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Nice concise list of Ajax issues that previously caused me to bang my head against the wall because I hadn’t read this list 🙂