[1] [CITE@en[Use USVString for all URLs]]
( ([[domenic]]著, [TIME[2016-05-20 22:02:29 +09:00]]))
<https://github.com/whatwg/html/commit/018b983b77b2cd908f6d00100e7e0abe893dd2c3>

[2] [CITE@en[Restrict (un)registerProtocolHandler to secure contexts]]
([[ericlaw1979]], [TIME[2019-11-20 03:44:22 +09:00]], [TIME[2021-03-17T09:35:47.000Z]])
<https://github.com/whatwg/html/commit/6772a0342e6ffebc922c60c770dce87371b6c968>

[3] [CITE@en[registerProtocolHandler and unregisterProtocolHandler should require SecureContext · Issue #5068 · whatwg/html]]
([TIME[2021-03-17T09:40:44.000Z]])
<https://github.com/whatwg/html/issues/5068>

[4] [CITE@en[Add SecureContext limitation for '''['''un''']'''registerProtocolHandler API by ericlaw1979 · Pull Request #5080 · whatwg/html]]
([TIME[2021-03-17T09:43:07.000Z]])
<https://github.com/whatwg/html/pull/5080>