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How it works
Rollback is available within recent change lists, page histories, diffs, user contribution pages, and your watchlist. When an admin or rollbacker sees an obviously inappropriate change (usually vandalism), it only takes one click (on the "rollback" link) to revert the changes. However, take care! Unlike the undo feature:
- Rollback affects the latest edits to the page. You cannot pick an older edit from the page history.
- If the last editor made multiple edits, they will all be reverted, to the last page version by another user. (Thus rollback is not available if a page only ever had one editor.)
- Rollback happens immediately. There is no confirmation or preview before the action.
The automatic edit summary looks like this:
Because the feature is used mostly to revert vandalism, links to the reverted user's contributions and talk pages are included to check for other bad edits, and/or issue warnings to that user.
Rollback always signals itself as a "minor edit", hence the bold m at the beginning.
When to use rollback
Rollback should be used only for reverts that are self-explanatory – such as removing obvious vandalism; to revert content in your own user space; or to revert edits by banned users who are not allowed to edit.
Provided that an explanation is supplied in an appropriate location, such as at the relevant talk page, rollback may also be used in circumstances where widely spread edits (by a misguided editor or malfunctioning bot) are judged to be unhelpful to the encyclopedia, since such edits would be tedious to revert manually.
However, reversion for other reasons requires an appropriate explanatory edit summary; unless this requirement is met by using tools that allow for different edit summaries, rollback would not be the appropriate method of reversion in those circumstances.
Rollback must, therefore, always be used with care. Although rollback is significantly faster and uses less bandwidth than other methods of reversion, do not worry about performance. When using rollback to restore text to a page, ensure that the text restored does not violate Wikia policies. When in doubt, use another method of reversion and supply an edit summary to explain your reasoning.
When not to use rollback
If there is any doubt about whether to revert an edit, please do not use this feature. Use the undo feature instead, and add a more informative edit summary explaining your revert. Anti-vandalism tools such as Twinkle, Huggle and rollback should not be used to undo good-faith changes in content disputes unless an appropriate edit summary is used. Misuse of rollback may cause the feature to be revoked by any administrator. Because rollback is a feature that administrators are automatically granted, administrators who misuse rollback may have their administrator privileges removed.
If you are reverting a user with a grossly offensive username which may need redaction, do not use rollback but instead use a reversion method (such as manual reversion, popups, or undo with a custom edit summary) which doesn't include the username in your edit summary.
Custom edit summaries
Tools are available to specify custom edit summaries with rollback. Two examples are wikipedia:User:Gracenotes/rollback.js and wikipedia:User:Mr.Z-man/rollbackSummary.js. A similar tool that prompts for a summary is wikipedia:User:Ilmari Karonen/rollbacksummary.js. Custom edit summaries help other editors when reviewing changes.
Two extra scripts with the rollback summary shown by default are at Wikipedia:User:Porchcrop/Rollback Summary.
To provide a custom edit summary manually, copy the rollback link, and append the URL parameter "&summary=summary"
How to apply
Editors may ask any administrator. Alternatively, you may file a request at Fairly Odd Parents Wiki:Requests for user rights.