As mocked up in https://phabricator.wikimedia.org/T363484#9765272 add a toolbar (or indicator) link for "report visual bug":
which then pops up a form which lets you attach the page title on which you saw the problem:
Description
Description
which then pops up a form which lets you attach the page title on which you saw the problem:
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T363484 Update ParserMigration notice | |||
| Open | None | T365371 ParserMigration: Add "report visual bug" link |