Source
@DomName('Document.visibilityState') @SupportedBrowser(SupportedBrowser.CHROME) @SupportedBrowser(SupportedBrowser.FIREFOX) @SupportedBrowser(SupportedBrowser.IE, '10') @Experimental() String get visibilityState => JS( 'String', '(#.visibilityState || #.mozVisibilityState || #.msVisibilityState ||' '#.webkitVisibilityState)', this, this, this, this);