xmlhttprequest - XMLHttpRequest.js - Standard-compliant cross-browser XMLHttpRequest object implementation (Note: project moved to http://github.com/ilinsky/xmlhttprequest)

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Important Notice: Project moved to http://github.com/ilinsky/xmlhttprequest

Deliver unobtrusive standard-compliant (W3C) cross-browser implementation of the XMLHttpRequest 1.0 object
Fix ALL browsers quirks observed in their native XMLHttpRequest object implementations
Enable transparent logging of XMLHttpRequest object activity

Browser Name	Problem description
All browsers	missing static members (UNSENT, OPENED, HEADERS_RECEIVED, LOADING, DONE)
Internet Explorer All / Opera All	missing EventTarget interface implementation
Internet Explorer 7.0	Native XMLHttpRequest object can't load local files in IE7 ^new
Internet Explorer<7.0	missing native XMLHttpRequest object support
Internet Explorer 6.0	memory leak caused by onreadystatechange handler (on-page)
Internet Explorer 6.0	memory leak caused by onreadystatechange handler (inter-page)
Internet Explorer All	connections leakage between pages
Internet Explorer All	onreadystatechange wrong execution context
Gecko All	onreadystatechange wrong execution context
Internet Explorer All	readystatechange OPENED fired twice
Gecko All	readystatechange OPENED fired twice
Gecko All	missing readystatechange calls in synchronous requests
Gecko All	unnecessary readystatechange DONE call when request aborted
Gecko All	annoying ">parsererror /<" document for invalid XML documents
Internet Explorer All	empty documents for invalid XML documents
Opera 9.x	empty documents for invalid XML documents
Internet Explorer 6.0	cached document is not checked against modification date (uncomment in source to use)
Internet Explorer All	responseXML is not properly initialized for application/xxx+xml responses
Safari 3.0	sending document created/modified dynamically chunks serializing
Internet Explorer All	custom Content-Type overridden when sending XML nodes

<head>
    ...
        <script type="text/javascript" src="XMLHttpRequest.js"></script>
    ...
</head>

implementation doesn't throw errors on accessing status and statusText properties in an inappropriate moment of time