Look again at browser defaults

[gaearon]

Not sure what we have there now but just leaving this for another look closer to 2.x
https://mobile.twitter.com/jamiebuilds/status/988559577313492992

[Timer]

create-react-app/packages/react-dev-utils/browsersHelper.js

Lines 16 to 21 in 789b856

	const defaultBrowsers = {
	development: ['chrome', 'firefox', 'edge'].map(
	browser => `last 2 ${browser} versions`
	),
	production: ['>1%', 'last 4 versions', 'Firefox ESR', 'not ie < 11'],
	};

We use the "last 2 versions" of modern browsers for dev so I think we're safe there, I think this generic rule (in the tweet) includes iOS/Android browser/IE which causes you to support "old browsers".

The "production" browser support is matching to what we supported in v1, so we could talk about modernizing that.

Our production match evaluates to:

I imagine we'd want to exclude [most] of those mobile browsers by default.

[ngbrown]

Evidently, the googlebot crawler is on Chrome v41 so there's that for sites which expect to be indexed. Supporting IE11 is probably keeping the output compatible for now.

[Timer]

Landed #4470 as a start, we can refine this more.