Last modified: 2014-10-19 18:57:22 UTC
Created attachment 10228 [details] Screenshot of unreadable maths on high contrast theme. When using a high contrast theme on Windows 7 (and maybe other OSs/versions), designed for visually impaired users, the output from "<math>" tags is almost unreadable. This is on Firefox with "Menu->Tools->Options->Content->Fonts & Colours->Advanced->Allow pages to choose their own colours" disabled (and the same under the "Colours" button above the "Advanced" button, instead opting to use the default OS theme. The theme in the OS is "High Contrast #1" - a default theme with yellow writing on a black background for better reading. The issue seems to come from the PNGs used to render the maths formulas having transparency and assuming that the background is always white. Attached is a screenshot of how these appear. This seems more serious than normal issues with custom themes given that it is a default theme designed to improve accessibility and instead restricts it.
Confirmed on windows 7 with firefox. Not much we can do about it, those PNGs are rendered long before anybody knows what theme you're running, the only option would be to render a second yellow on black image based on preferences (ugh) or force the background to be white (no effect on most users, since it's already on a white background).
Switching the default math rendering to MathJax should help with this; can you test this page? http://leuksman.com/mw/index.php/Alpha_compositing
Brion, that link looks right in the high contrast theme. I was trying to find the render in browser option in live but it seems to have been (rightfully) killed, is this a new math system?
(In reply to comment #3) > is this a new math system? http://www.mathjax.org/
You could try to automatically change the background color of the formulae using the script http://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&action=edit&oldid=478966050 which was suggested on enwiki's Village Pump: http://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(technical)/Archive_97&oldid=481032812#I.27m_a_dark_background_kind-a-guy.3B_I_set_my_browser_to_ANYTHING_but_white_..._so_equations.2C_formulas.2C_practically_anything_notated_at_wiki_appearing_as_clear-backgrounded_image_is_absolutely_unintelligable (In reply to comment #1) > force the background to be white (no effect on most users, since it's > already on a white background). I think that would unfix bug 8.
That MathJax system seems to work here too.
Created attachment 16807 [details] MathML in high contrast
The new MathML rendering mode seems to fix it.
(In reply to physikerwelt from comment #8) > The new MathML rendering mode seems to fix it. I think it would be a good idea to put a screenshot on http://math-preview.wmflabs.org/wiki/Main_Page#Demos
