This document defines a mechanism to enable client-side cross-site requests. It is expected that this document will progress along the W3C Recommendation track. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. The design of this specification introduces is based on requirements and use cases, both included as appendix. A FAQ describing the design decisions is also available. This specification is a building block for other specifications, which will define the precise model by which this specification is used.”]
Source: http://www.w3.org/TR/2008/WD-access-control-20080912/