As inspired by Steve Faulkner's short article HTML Developers: Please Consider – in the year of 2021, this CSS is a diagnostic file that aims to highlight HTML elements that have roles that should probably be native HTML equivalents (indicated in red with 🚨 symbol) or native HTML elements that probably don't need a role attribute (indicated in orange with ⚠️ symbol).

You can use the test markup page to verify this is working as it should.

Indicates key structural elements of a page, such as headings, lists, landmarks.