The InPagePermissionMixin seems like too much

[marcoscaceres]

As the WebApps WG discussed around the imperative API, it would be good simplify all this just down to showing the request for installation sheet. That only requires knowing if the UI was aborted and if the app was installed.

Throwing in the InPagePermissionMixin seems like too much.

Installation is not about "permission"... it's about showing a showing an installation sheet.

[tomayac]

I guess the idea is to enable the cross-origin installation use case: https://microsoftedge.github.io/Demos/pwa-pwastore/. The PWA Store first needs to ask for permission whether it may install other apps before it can offer this feature.

[marcoscaceres]

See the TAG's feedback regarding cross-origin installs:
w3ctag/design-reviews#1051 (comment)

WebKit gave the same feedback. Trying to backdoor cross-origin installs into this in a non-starter.

We should focus on same origin installs. That's difficult enough as it is, and it solves the 95% use case.