* 歴史

[2] [CITE@en[Add the <iframe allowpaymentrequest> attribute]]
([[sideshowbarker]]著, [TIME[2016-12-20 00:03:36 +09:00]])
<https://github.com/whatwg/html/commit/af407d47fe17b93b74f12c3538d39a7597acdab2>

[1] [CITE@en[Snapshot allowpaymentrequest and allowusermedia attributes]]
([[zcorpan]]著, [TIME[2017-01-15 01:54:58 +09:00]])
<https://github.com/whatwg/html/commit/b3224a8457e32015153ed91f26b6212e25df1d6b>


[3] [CITE@en[Integrate Feature Policy concepts into HTML]]
([[clelland]]著, [TIME[2018-06-23 05:22:11 +09:00]])
<https://github.com/whatwg/html/commit/78741b7b5471ba213c68a22caff1a53c56d35ce8>