I noticed recently, that Mathematica on-line documentation (on the web) is becoming hard to read. The Math looks terrible. Blurry and fussy. I do not remember this used to be the case before. I really did not expect this at Wolfram web sites.
When going to any help page on the web, which has math, the math seems to use low quality png images. Here is an example below.
If images must be used, I suggest to use SVG for math images. SVG is vector graphics and provides higher quality math.
https://reference.wolfram.com/language/ref/FourierCoefficient.html (open the detailed section to see)
