Thanks Guenter!
> In URIs, backslash-escaped whitespace represents a single space.
Regarding the handling of whitespace in URIs, it seems that there is a wide range of influence, but I think that it is practically unnecessary to deal with Sphinx side.
> Fix [ 319 ] The MathJax CDN shut down on April 30, 2017. For security reasons, we don't use a third party public installation as default but warn if math-output is set to MathJax without specifying a URL.
I have not confirmed the details of other changes, but I felt that it would not have any major impact.
@tk0miya, please take a look later.
Best,