[Feature Request]: Dont-try-this-at-home codeblocks

[davidveen]

Description

Codeblocks containing pseudocode, conscious errors, or other don't-try-this-at-home ideas are a great teaching tool, but might benefit from a visual indication aside from (con)textual hints. It should be clear enough so that a reader scrolling through code examples doesn't end up copying non-working code or patterns marked as 'bad'.

Describe the solution you'd like

A warning triangle in the corner or a different border would go a long way. Here be dragons! 🐉

Describe alternatives you've considered

No response

[crutchcorn]

Assigning @PrattiDev as he's our design lead for the site, which is where this would start (Ed, no priority on this; just wanna get your thoughts on this whenever you get time)