Please explain why PWA installation prompt only works on Chrome

[mvysny]

The file tutorial-pwa-introduction.asciidoc currently says

PWA installation prompts are a feature only available for Chromium-based browsers. This feature is being phased out in later version of Vaadin in favor of a more universal user experience.

The documentation is short and uninformative, it doesn't answer the following questions:

Why was the PWA installation prompt never implemented in other browsers? Is it implemented in Edge? Safari? Why Firefox decided to remove this functionality?

There's more info at vaadin/flow#8038 but the discussion is lengthy&technical.

[rolandoisidoro]

@mvysny , take a look at the Distribution and support for PWAs by platform section on Vaadin July 2020 edition
blog post on the The state of progressive web applications.