This extension hook has no documentation on MediaWiki.org. Please improve MediaWiki by adding documentation to it. See Template:ExtensionHook for instructions on how to do it.

For examples of extensions using this hook, see Category:VisualEditorBeforeEditor extensions . Category:Extension hooks#VisualEditorBeforeEditor Category:Undocumented extension hooks#VisualEditorBeforeEditor Category:Extension hooks provided by VisualEditor Category:Extension hooks#VisualEditorBeforeEditor Category:Undocumented extension hooks#VisualEditorBeforeEditor Category:Extension hooks provided by VisualEditor