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Improve definition of “basic support” in MediaWiki's browser support matrix around CSS
Open, Needs TriagePublic

Description

As of current, the browser support matrix for MediaWiki core “and any MediaWiki extensions that decide to follow it” is generally aimed clearer on infrastructure and JavaScript support, but leaves vague what CSS support should look like.

Basic (Grade C)
The group (also known as Grade C) is provided the core functionality of the MediaWiki platform. Our HTTP responses are compatible with these browsers (e.g. HTTP features we rely on, character encoding, and image formats used by the content; must work in these browsers). In the front-end this means content is presented in a readable manner, and to some extent user actions can be performed, but these browsers do not get JavaScript features.

Browsers in this category are known (listed below) and identified via a feature test suite and a blacklist in the startup module.

In conversations, a number of voices were referring to “navigable”, “readable”. These attributes might be fine on a Readers experience side, they don't mean enough on a contributors side. And more importantly, such attributes are nowhere in there currently.

In my opinion clarifying the language would enable product teams to make better choices about the roads needed to be taken and also help in future decisions on changes like T248061