Re: [w3c/manifest] Install button on another domain (#726)

There is an attempt of a PWA store here: https://progressiveapp.store/  . They do not have an install button. The only thing they can do is to open the website of the PWA. Then, the user should hope the default PWA installing will be triggered. If the "beforeinstallprompt" is used, the user has to spend a lot of time to find a custom Install button in the UI of the webapp (which can be at a different location for each webapp). 

What about the custom URL address:

    <a href="install:www.Instagram.com">Install Instagram</a>

After clicking such link, the browser checks, if there is a manifest and a PWA installable at that link, and shows a prompt for installing the PWA without even going to that site. Abusing it is no more dangerous than abusing window.confirm() and browsers know how to handle it.

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