[Feature] Display coverage chart for currently selected browsers

[antross]

🚀 Feature request

Description

What do you want to be added?

Show a chart during configuration of target browsers illustrating the coverage of the current selection and coverage changes as target browsers are added/removed.

The browserslist package used by webhint for selecting target browsers includes both global and regional coverage data for browsers as well as the ability to feed in custom coverage data. It can use this to report the coverage of a set of target browsers, e.g. defaults today reports These browsers account for 87.34% of all users globally.

Are you willing to work on this?

Yes.

What scenarios will this solve?

Why do you want/need this?

Having coverage data can help developers make more informed decisions about their target browsers and the potential impact of hints reported by webhint.