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IE has been basically standards-compliant for XHR since IE9, and possibly before:

For IE9, don't you need IE-specific code for cross domain requests?

Yeah, you need XDomainRequest for CORS requests in IE8 and 9. IE10 is fully standards-compliant.

It is very castrated, better to use hidden iframe + window.postMessage for cors in ie8 and ie9.

I don't think "castrated" is the word you meant :-) Perhaps "constrained" or "restricted"

...why not?

"to render impotent or deprive of vitality"

Funny, because IE invented XHR.