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Web IDL is a format for describing interfaces that are intended to be implemented in web browsers. Web IDL is an IDL variant with a number of features that allow the behavior of common script objects in the web platform to be specified more readily. How interfaces described with Web IDL correspond to constructs within ECMAScript execution environments is also detailed in this document. It is expected that this document acts as a guide to implementers of already-published specifications, and that newly published specifications reference this document to ensure conforming implementations of interfaces are interoperable.
Status of this specification
As of 19 April 2012, Web IDL specification document became Candidate Recommendation of the Web IDL specification. When the document reaches "Recommendation" status, it will have the full powers of W3C standards.
Usage
W3C Wiki has a list of W3C Specifications that use Web IDL. [1]
Mozilla uses Web IDL in their software creation process, mapping implementations to Web IDL specs [2].
When WebKit is built, the IDL files are parsed, and the code to bind WebCore implementations and JavaScriptCore, V8, ObjC, GObject and CPP interfaces is automatically generated. [3]