- outline: facts from the editor and the Source tab, skipped, empty and
link-only headings, the H1 flag only in the Source tab while level 1 is
not offered, generic texts, the 300 ms debounce without edits
- link form: rel follows the URL as typed, only checked tokens written,
none for internal links, the generic warning never blocks
- image form: the slug rule examples, decorative clears and locks alt
