MathPopupsTestInNs0

This page is to debug a technical problem in Extension:Math. Please ignore it. In https://en.wikipedia.org/wiki/Mass–energy_equivalence popups works for logged in an anonymous users, but not here. This it does not seem to be related to extension math.

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Class "Wikibase\Client\WikibaseClient" not found"): {\textstyle E=mc^{2}}

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Class "Wikibase\Client\WikibaseClient" not found"): {\displaystyle E=mc^{2}}