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Reference.org
Web IDL
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<p>Web IDL is an <a href="/facts/Interface_description_language/FpByLf4X">interface description language</a> (IDL) format for describing <a href="/facts/API/GMlN4vUr">APIs</a> (application programming interfaces) that are intended to be implemented in <a href="/facts/Web_browser/2pfyymLs">web browsers</a>. Its adoption was motivated by the desire to improve the interoperability of web programming interfaces by specifying how languages such as ECMAScript should bind these interfaces. </p>