MediaWiki:Visualeditor-preference-visualdiffpage-info-link
This is [[MediaWiki:Tagline]]. Set to <code>display:none</code> by chameleon skin.
//www.mediawiki.org/wiki/Special:MyLanguage/VisualEditor/Diffs
//www.mediawiki.org/wiki/Special:MyLanguage/VisualEditor/Diffs