Author: gnu1742

Description:
In http://bits.wikimedia.org/w/extensions-1.18/MobileFrontend/stylesheets/default.css?version=01182012210728 there is the following style rule:

.printonly, .geo-multi-punct, .geo-nondefault, .Z3988 { display: none; }

This rule renders any html-Element of the class '.Z3988' invisible. This class is an Element of "OpenURL COinS: A Convention to Embed Bibliographic Metadata in HTML" (see http://ocoins.info/).

Have a look at this Page in both formats: Web and mobile
http://de.wikipedia.org/wiki/Sichtigvor
http://de.wikipedia.org/wiki/Sichtigvor?useformat=mobile

At the very bottom of the pages you find the references, called 'Einzelnachweise'. While the first reference is shown in both web and mobile, the second reference is only shown in web. This happens on a lot of pages in Wikipedia.

In de-wp, COinS is used a lot. It is part of the Template {{Vorlage:Literatur}}, which is used to format bibliographical data in Articles and is one of the most used templates.

This style-rule hides real content so i urge you to remove '.Z3988' from the classes to be hidden.

There is simply no reason to render the content of the span of class '.Z3988' invisible, since the COinS-Data is only included in the title attribute (and therefore isn't rendered at all) of that span and doesn't collide with the content. Even the COinS Generator on http://generator.ocoins.info/?sitePage=info/book.html& generates code, where you can clearly see that the content of the span-Element should be shown.

Version: --
Severity: normal