📝 Docs: Explicitly state browser version support range on mochajs.org

[JoshuaKGoldberg]

Documentation Request Checklist

• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I want to provide a PR to resolve this

Overview

Forking out of #5225:

Not sure what browser versions do mocha intend to support.

Yes, good point, this is never explicitly stated in full on the README.md or https://mochajs.org. Searches for chrom and firef yield no relevant results. The only version range mentioned is:

mocha/docs/index.md

Line 68 in 8711e72

> As of v10.0.0, Mocha requires Node.js v14.0.0 or newer.

Additional Info

No response

[mark-wiemer]

I found this:

https://github.com/mochajs/mocha/blob/main/PROJECT_CHARTER.md?plain=1#L55

§2.2: Out-of-Scope

...

• Use within browsers not meeting a threshold decided upon by maintainers

[JoshuaKGoldberg]

Amusing.

My proposal would be to sync the timeline of browser support with Node.js support. As in, Mocha should support the versions of mainstream browser versions that were most current when the supported Node.js versions were released. Including data on the Node.js 14 (released April 21st, 2020) support equivalents from #5225 (comment):

• Chrome/Chromium 81 released April 7, 2020: https://developer.chrome.com/blog/new-in-chrome-81
• Firefox 75 released April 7, 2020: https://www.mozilla.org/en-US/firefox/75.0/releasenotes
• Safari 13.1 released March 24, 2020: https://developer.apple.com/documentation/safari-release-notes/safari-13_1-release_notes