[5] typeof 属性は、 RDFa 1.1 で新規に提案されていた属性でした。
ほとんど使われませんでした。
[1] RDFa Core 1.1 - Second Edition ( ( 版)) http://www.w3.org/TR/rdfa-core/#A-src
[2] RDFa Core 1.1 - Second Edition ( ( 版)) http://www.w3.org/TR/rdfa-core/#h4_use-of-curies-in-specific-attributes
[3] XHTML+RDFa 1.1 - Second Edition ( ( 版)) http://www.w3.org/TR/2013/REC-xhtml-rdfa-20130822/#A_typeof
[4] HTML+RDFa 1.1 ( ( 版)) http://www.w3.org/TR/2013/REC-html-rdfa-20130822/#extensions-to-the-html5-syntax
[6] Specify what typeof should return for exotic objects (TimothyGu著, ) https://github.com/heycam/webidl/commit/5de45d9bc817fb0ce3f498e4ca9c14adbee2d172
[7] typeof operator and platform objects · Issue #512 · heycam/webidl () https://github.com/heycam/webidl/issues/512
[8] Specify what typeof should return for exotic objects by TimothyGu · Pull Request #640 · heycam/webidl () https://github.com/heycam/webidl/pull/640
[9] Implementation-defined typeof still necessary? · Issue #1440 · tc39/ecma262 () https://github.com/tc39/ecma262/issues/1440
[10] JavaScript defines typeof fully now (annevk著, ) https://github.com/heycam/webidl/commit/ed986625a77fad9db2260a4219b9c58d25bb7756
[11] Specify what typeof should return for exotic objects (TimothyGu著, ) https://github.com/heycam/webidl/commit/5de45d9bc817fb0ce3f498e4ca9c14adbee2d172
[12] Specify what typeof should return for exotic objects by TimothyGu · Pull Request #640 · heycam/webidl () https://github.com/heycam/webidl/pull/640
[13] typeof operator and platform objects · Issue #512 · heycam/webidl () https://github.com/heycam/webidl/issues/512
[14] Implementation-defined typeof still necessary? · Issue #1440 · tc39/ecma262 () https://github.com/tc39/ecma262/issues/1440
[15] Normative: Remove implementation-defined typeof behavior by littledan · Pull Request #1441 · tc39/ecma262 () https://github.com/tc39/ecma262/pull/1441
[16] JavaScript defines typeof fully now by annevk · Pull Request #712 · heycam/webidl () https://github.com/heycam/webidl/pull/712