User blog comment:Kjsheepys/Question/@comment-5392675-20141219031049

"Randomly delete" like... how? As in in the case of an edit conflict and you click Resolve conflict? By clicking that option, the page gives you the source code and leaves you to figure everything out (which can be fixed by Undo-ing). To avoid this happening, either alert a person you know is editing the same page or click Cancel and not Resolve and just go back, copy everything (or just what you edited, your choice) and paste it back on the article. :)