[1] Export the 'install' term. (jyasskin著, ) https://github.com/w3c/manifest/commit/96413889d40bc511450c1bd31bc803a4260db6b9
[2] Integrate `<install>` element (pending second implementer interest) · Issue #13011 · whatwg/html, https://github.com/whatwg/html/issues/13011
[3] GitHub - WICG/install-element: An `<install>` element might be nice. · GitHub, https://github.com/WICG/install-element