`{:class="center"}` on images is no longer rendering

[carols10cents]

I happened to land on this post that I happened to have written, unfortunately I don't happen to remember why I added {:class="center"} on the image in the markdown that isn't being interpreted and currently looks like this:

I don't remember if that's a markdown feature, a jekyll feature, or a hack.

Is this obsolete and something that should just be removed? Or should the rendering be fixed? Is this feature used anywhere else on the blog? More that I don't know :P

[steveklabnik]

I am not sure! We need to investigate though.!

[steveklabnik]

I did some digging. apparently it's a feature of kramdown: https://about.gitlab.com/2016/07/19/markdown-kramdown-tips-and-tricks/#applying-classes

which the old blog was using:

blog.rust-lang.org/Gemfile.lock

Line 74 in 14389a8

kramdown (= 1.17.0)

This appears to be non-standard https://stackoverflow.com/questions/1058933/can-i-define-a-class-name-on-paragraph-using-markdown

I think in this specific case, we can remove it, as the class isn't really doing anything, but we should also audit posts to check for any other usages of this.

[jplatte]

I've rged for any remaining uses of this kramdown feature and actually found some! I'll open a PR shortly to remove them, just want to note that I have also found cases where this makes a visual difference (e.g. the post on incremental compilation). If images that aren't wide enough should always be centered, I'm happy to make a PR for that as well.

[steveklabnik]

Thanks so much! Yeah, if we can actually center them, that'd be great too.