If you view the following HTML, shr will (on mouseover etc) display the
domain as something that looks like "www.microsoft.com", when it's
really an IDNA domain with a cyrillic letter in the middle.

I thought eww/shr had fixed this everywhere, but apparently it's just in
the eww header line.  shr should also apply the same rules (for mixing
latin and non-latin characters) and display the link as
"www.xn--mirsft-yqfbx.com" or something.  Perhaps with a warning, even.