[1] Remove the context menu feature (domenic著, 2017-06-09 03:16:29 +09:00) https://github.com/whatwg/html/commit/e7e8c88ecdd7cdc96171f05ab6fe23b56dd48d8a

[2] Remove "onhide" from obsolete attributes (a1626著, 2017-08-29 19:59:57 +09:00) https://github.com/whatwg/html/commit/361207c9ab4555de7ba21cdd1181d7cea116c2a8

[3] Remove "onhide" from obsolete attributes · Issue #2860 · whatwg/html (2017-08-30 19:04:12 +09:00) https://github.com/whatwg/html/issues/2860

[4] Fixing #2860 (Remove "onhide" from obsolete attributes) by a1626 · Pull Request #2976 · whatwg/html (2017-08-30 19:04:39 +09:00) https://github.com/whatwg/html/pull/2976