A feature’s markup renders correctly, but looks completely unstyled – plain default browser appearance instead of the intended design.
⚡ Quick Fix (TL;DR)
The Culprit: When a single feature's markup and its styling live in two separate files or snippets, updating one without the other leaves the new markup with zero matching styles – and because nothing throws an error, this can go unnoticed for a long time.
The Fix: Whenever a feature's HTML or PHP output changes, treat its matching CSS as part of the same change, not a separate task – check both together, especially after adding a new element type or changing how something filters or displays.
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