Define browser matrix [feature request]

[drydenwilliams]

It would be great to know what browsers we are going to support e.g.

• Chrome - v-x-x
• Firefox - v-x-x
• Safari
• Internet Explorer

Once we have done this we can explore any polyfills needed and also code for older versions if needed.

I raise this as we have used object-fit which is not supported on IE11 and looking at these stats from Africa (https://gs.statcounter.com/os-market-share/all/africa) Windows the most common OS.

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From @chrismclarke point:

I would suggest opening an issue to include defining the platforms we would like to support, and if possible good ways to help automate testing on them

[chrismclarke]

Whilst we're talking about this, it would be good to have some way of automating some of the tests on multiple browsers, even if only in a very basic way (current e2e testing only supports chrome/chromium/electron).
cypress-io/cypress#310

I'm sure someone put some links for this somewhere at some point but I can't track them down

[chrismclarke]

Somewhat related, in the future we could try doing some additional automated testing with https://github.com/microsoft/playwright

Playwright is similar to google's puppeteer (automated chrome web browser for testing), but supports more browsers. Suggest we want to be testing:

• chrome
• firefox
• safari
• edge (although now just runs chromium)
  And if possible variants such as desktop, mobile, and if possible incognito.

Example browser stats:

• https://browserl.ist/?q=%3E+1%25
• https://browserl.ist/?q=cover+90%25

[chrismclarke]

Update - cypress now also supports firefox and edge, so could be worth adding or including for a small subset of tests.
https://docs.cypress.io/guides/guides/launching-browsers.html#Browsers
https://docs.cypress.io/guides/guides/cross-browser-testing.html#Continuous-Integration-Strategies

[chrismclarke]

Update - created PR #950 which adds firefox testing support.

Going through various docs and forum issues, it does not appear that cypress will ever support incognito mode (it itself is a plugin which would therefore be disabled), so I think this is about as good as we can do. It also is clear that it would be a huge undertaking to write our own test library to use with playwright on safari (which itself is still not very stable), so I don't think that could be considered reasonable. There is an open issue and discussion for supporting macOS Safari within cypress, so if that ever lands we can include, but for now I consider this issue closed.