Formerly one could use \stigma and \koppa within mathematical notation in Wikipedia articles. Perhaps only one article used them, but it does rely on them. What appears now is just blank spaces. See the section titled "The numeral system and the appearance of the untranslated table" in the article titled "Ptolemy's table of chords". Look for stigma and koppa in both of the tables. Blank spaces appear where stigma and koppa should appear.
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Please always provide a link to an example - I assume this is about https://en.wikipedia.org/wiki/Ptolemy%27s_table_of_chords#The_numeral_system_and_the_appearance_of_the_untranslated_table ?
Blank spaces appear where stigma and koppa should appear.
Not here. "Math" on https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering is set to
"MathML with SVG or PNG fallback". Please provide steps to reproduce.
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I just looked at that page and \koppa and \stigma are working now. Was something done to fix them?
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OK I now see that \koppa and \stigma work when I'm not logged in, but not when I am. On my preferences page under "Math" I've chosen "MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools)". I would not think that any choice of preferences should cause these letters not to be visible.
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@Physikerwelt you need to check on all browsers ;-) I can reproduce this on Chrome and Web/Epiphany.
I can't find it but there was a similar report earlier.
The problem seems to be a browser bug regarding <text> elements in SVGs used as background images. I.e., https://en.wikipedia.org/w/index.php?title=Special:MathShowImage&hash=201dbb2fde10937103359420fe8d8b84&mode=5 looks fine in Chrome and Web as a standalone image but in the page the koppa won't show.
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Here's an isolated version: http://jsbin.com/zufeziwofu/1/edit?html,output
Kudos to Firefox for getting it right. Now if only all browsers were like Firefox wrt to mathoid ;-)
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This seems to be the corresponding Blink bug https://code.google.com/p/chromium/issues/detail?id=403375
Perhaps somebody from WMF could bump it?
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Anybody can bump it. Just do it. It's not that WMF has some special powers or such, really. :)
This comment was removed by Pkra.
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@Pkra: Heh, no problem. Still you can add a comment to that upstream ticket as much as I can do. It's not that some "@wikimedia.org" address should suddenly change prioritization in Chromium. Arguments should.
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I believe the Chrome/Blink issue was fixed a while ago. All but Safari render this correctly nowadays and for Safari this is a duplicate of T130967.