Minor is very relative here, especially with regards to Firefox.
IMO anyone who only tests against Chrome and Safari is seriously wrong. The amount of features not supported by Firefox or Edge are relatively small and so basically everything except for a few special cases should just work everywhere.
Re:Documenting the Web together
by TazeTSchnitzel on Thursday October 19, 2017 @08:00AM
(#15507132)
Chrome descends from WebKit, but it isn't WebKit. As I unfortunately learned recently when a workaround for a WebKit bug broke modern Chrome.
It depends on the user base. Customers of the company I work for mostly use IE or Edge and only Chrome because we highly suggest it. Without decent IE/Edge support we would have less customers.
Many sites already don't work correctly in Edge, IE11 nor Firefox - it's too late, these are minor browsers, used by a smaller fraction of end users. End users on on smartphones use 95% a WebKit originated based browser aka Chrome/Safari. Chrome and Safari are bigger than the rest on desktop.
Sites in 2017 are tested against Chrome and Safari by web developers.
http://gs.statcounter.com/browser-market-share/desktop/world...
http://gs.statcounter.com/browser-market-share/mobile/worldw...