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MediaWiki:Apihelp-query+revisions+base-param-difftotext

From p99 Backup

Use action=compare instead. Text to diff each revision to. Only diffs a limited number of revisions. Overrides $2diffto. If $2section is set, only that section will be diffed against this text. For performance reasons, if this option is used, $2limit is enforced to $1.