Per this: https://www.freecodecamp.org/forum/t/forum-suggestion-unformatted-code-warning/134857/24 `<code>` tags are not the semantically/idiomatically correct way to format code on Discourse. For example, `<code><span></span></code>` renders as that exact HTML, when the intention was almost certainly to render `<code><span></span></code>` instead.