dead-target

The failure

hx-target="#something" where #something is not in the document (and not in knownIds). htmx finds no target and falls back to the triggering element — so the response lands somewhere nobody intended, often swallowing the control that was clicked.

Relative targets (this, closest …, find …, next, previous, body, document) are skipped: they cannot be resolved without a live DOM. Non-#id selectors are skipped too.

Why nothing else sees it

A typo in a string attribute. Fragments legitimately point at page ids that are not in the fragment — which is why this rule runs only on whole pages (or when you pass knownIds).

The fix

Point at an id that exists, or register it and pass knownIds when checking a partial. Prefer the OOB registry in a PLEYN app so targets stay compile-time checked — see Generated reference.md.