[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 ( (2013-08-15 17:12:47 +09:00 版)) http://www.w3.org/TR/rdfa-core/#A-src

[2] RDFa Core 1.1 - Second Edition ( (2013-08-15 17:12:47 +09:00 版)) http://www.w3.org/TR/rdfa-core/#h4_use-of-curies-in-specific-attributes

[3] XHTML+RDFa 1.1 - Second Edition ( (2013-08-15 17:11:45 +09:00 版)) http://www.w3.org/TR/2013/REC-xhtml-rdfa-20130822/#A_typeof

[4] HTML+RDFa 1.1 ( (2013-08-20 15:49:04 +09:00 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, 2019-02-26 00:23:05 +09:00) https://github.com/heycam/webidl/commit/5de45d9bc817fb0ce3f498e4ca9c14adbee2d172

[7] typeof operator and platform objects · Issue #512 · heycam/webidl (2019-06-21 17:08:45 +09:00) https://github.com/heycam/webidl/issues/512

[8] Specify what typeof should return for exotic objects by TimothyGu · Pull Request #640 · heycam/webidl (2019-06-21 17:10:26 +09:00) https://github.com/heycam/webidl/pull/640

[9] Implementation-defined typeof still necessary? · Issue #1440 · tc39/ecma262 (2019-06-21 17:10:49 +09:00) https://github.com/tc39/ecma262/issues/1440

[10] JavaScript defines typeof fully now (annevk著, 2019-04-11 17:09:00 +09:00) https://github.com/heycam/webidl/commit/ed986625a77fad9db2260a4219b9c58d25bb7756

[11] Specify what typeof should return for exotic objects (TimothyGu著, 2019-02-26 00:23:05 +09:00) https://github.com/heycam/webidl/commit/5de45d9bc817fb0ce3f498e4ca9c14adbee2d172

[12] Specify what typeof should return for exotic objects by TimothyGu · Pull Request #640 · heycam/webidl (2020-01-12 12:27:26 +09:00) https://github.com/heycam/webidl/pull/640

[13] typeof operator and platform objects · Issue #512 · heycam/webidl (2020-01-12 12:28:03 +09:00) https://github.com/heycam/webidl/issues/512

[14] Implementation-defined typeof still necessary? · Issue #1440 · tc39/ecma262 (2020-01-12 12:29:35 +09:00) https://github.com/tc39/ecma262/issues/1440

[15] Normative: Remove implementation-defined typeof behavior by littledan · Pull Request #1441 · tc39/ecma262 (2020-01-12 12:31:46 +09:00) https://github.com/tc39/ecma262/pull/1441

[16] JavaScript defines typeof fully now by annevk · Pull Request #712 · heycam/webidl (2020-01-12 12:33:31 +09:00) https://github.com/heycam/webidl/pull/712