On my screen, the stroke width of the SVG formulas is darker than the PNG formulas.
Perhaps we could try to adjust the blacker parameter for the SVG images:
blacker: 10
This is the stroke width to use for all character paths (1em = 1000 units). This is a cheap way of getting slightly lighter or darker characters, but remember that not all displays will act the same, so a value that is good for you may not be good for everyone.
See http://docs.mathjax.org/en/latest/options/SVG.html and https://github.com/mathjax/MathJax/issues/927.
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=72553