Help:Reference Previews

The Reference Previews feature shows a preview of a footnote when you hover over its footnote marker. This feature is part of the MediaWiki extension extpopups>Extension:Popups|Popups, which is used for pagepreviews>Page_Previews|Page Previews. It's currently a beta feature on first wikis.

Background
The Reference Previews feature aims to fulfill a wish from the German-speaking community's Technical Wishlist and is developed by WMDE's Tech team, with support from the WMF’s Reading Web team. The design for this feature is being developed by the WMF.

More information can be found on the RefPreviews>m:WMDE Technical Wishes/ReferencePreviews|main project page on Meta.

Activate the feature
Reference Previews will first be available as a beta feature. In order to use it, you have to
 * be logged in and tick the checkbox for "Reference Previews" in your setBeta>Special:Preferences#mw-prefsection-betafeatures|beta feature settings,
 * have pagepreviews>Page_Previews|Page Previews [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering enabled],
 * setGadgets>Special:Preferences#mw-prefsection-gadgets|disable [https://en.wikipedia.org/wiki/Wikipedia:Tools/Navigation_popups Navigation Popups ] (otherwise, Reference Previews won't show),
 * disable the RefTooltips>Reference_Tooltips|Reference Tooltips gadget (recommended, because otherwise two pop-ups will appear).

Look and behavior
Scope of the very first version of this feature:
 * The pop-up opens when you hover over or when you click on a footnote marker.
 * It gives a preview of the footnote as it is shown at the bottom of the page. Inside the preview, all kinds of footnote content (text, images, tables, …) can be displayed.
 * Reference Previews look like pagepreviews>Page_Previews|Page Previews. This way, all pop-ups have the same design, no matter if you hover over a page link or a footnote marker.
 * At the top of the pop-up, the reference type is shown (more info below).
 * For short footnotes, the pop-up window adjusts to a smaller size. If the footnote size exceeds the maximum pop-up size, you can scroll to read the whole footnote.
 * Clicking on the link "Jump to reference" brings you to the actual footnote in the footnote section.
 * Links that are part of a footnote open in a new tab.
 * After the beta phase, a settings cog will take you to your user settings for this feature.

Displaying the reference type
First tests have shown that displaying the type of a reference can help readers judge its trustworthiness more quickly; e.g. a journal publication is more trustworthy than a blog post.

This is how the categorization works:
 * Currently there are four types of references defined: Web Reference, Journal Reference, Book Reference and News Reference. Apart from that there is always a generic "default" type, which is simply named Reference.
 * Technically speaking, the type of a reference is defined by CSS-classes, e.g.   for journal references. These classes are set in the   element in a reference's content (classExamples>Page_Content_Service/References#Example 3: Various citation types</>|more info).
 * On most wikis, you can assign a class to a reference by using templates. For example, the English  templates specify their respective class already. Classes can be added to other templates as well.
 * Alternatively, you can add a cite class directly into a ref tag, e.g. <tvar|refExample1> </>.
 * References without cite tags and classes (e.g. plain <tvar|refExample1> </> tags) are shown as "Reference".

JavaScript
The preview uses JavaScript. If you don't have JavaScript activated, you'll get the current view: Footnote markers are jump marks and there's no preview.

Deployment roadmap

 * ✅ test.wikipedia.org : 2019-02-28
 * small beta:
 * German Wikipedia: planned for 2019-04-04
 * Arabic Wikipedia: planned for 2019-04-04
 * full beta:
 * all Wikipedias: tba

Links

 * extension manual on Mediawiki.org

Reference Previews
 * project board on Phabricator
 * main project page on Meta
 * central feedback page on Mediawiki.org

Page Previews
 * main project page on Mediawiki.org
 * central feedback page on Mediawiki.org

Help with translation
The software messages for this feature can be translated on translate wiki. Any help is much appreciated!