I noticed this morning that links to comments in the form
do not work anymore (at least on Firefox and Chrome browsers).
These links used to trigger the default scroll to element with id behavior, but a CSS rule
display: contents; on these elements breaks the feature (since they don't have their own box anymore, browsers can't scroll to it).
FF37+ and Chrome 58+ with
Enable experimental Web Platform features flag.
Links in the form
https://SE-site/posts/comments/comment_id do work as intended thanks to js, so this doesn't affect links in in-box messages.