MediaWiki:Explainconflict

Someone else has changed this page since you started editing it, resulting in an edit conflict.

The upper text area contains the page text as it currently exists (without your changes). Your version of the page (with your changes) is shown in the lower text area. You will have to merge your changes into the existing text in the upper text area to incorporate your edits.

Only the text in the upper text area will be saved when you press "Save page"; all other changes in the lower text area will be lost.