https://bugzilla.wikimedia.org/show_bug.cgi?id=71929

            Bug ID: 71929
           Summary: SVG images should not be loaded when MathML is used
           Product: MediaWiki extensions
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Math
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
        Depends on: 71912
            Blocks: 65341
       Web browser: ---
   Mobile Platform: ---

For Gecko browsers, ext.math.css forces "display: none" on SVG and makes the
MathML visible. It turns out that this is not enough to prevent the SVG images
from downloading, as Gabriel noted in
https://gerrit.wikimedia.org/r/#/c/165658/ for the PNG fallback.

It seems that there are some CSS tricks to really prevent hidden images to be
loaded and we should give them a try:
http://timkadlec.com/2012/04/media-query-asset-downloading-results/

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