Clarify OOB swaps with restricted sibling elements in Troublesome Tables docs #3623
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Description
This PR clarifies an edge case in the “Troublesome Tables” documentation where out-of-band swaps may require wrapping in even when the OOB element itself is valid, due to HTML sibling placement rules.
Corresponding issue:
This is based on discussion in issue #3203.
Testing
Not applicable (documentation-only change).
Checklist
masterfor website changes,devforsource changes)
approved via an issue
npm run test) and verified that it succeeded