01d74549_ikipedia_Vandalism___Wikipedia__Type
[Description] Any form of vandalism that makes use of embedded text, which is not visible to the final rendering of the article but visible during editing. This includes link vandalism, or placing malicious, offensive, or otherwise disruptive or irrelevant messages or spam in hidden comments for editors to see. [Type] 
Hidden vandalism
Wikipedia:Vandalism - Wikipedia
Type