bracketed spans and fenced div extensions

[g-braeunlich]

What do you think about the following extensions?

• fenced divs
• bracketed spans

Thought naively, this should not be that difficult, as functionality could be reused from fenced codeblocks and links.
The only complication, I could think of would be nested bracketed spans / links, but I guess that [ and ] chars inside a link description are already handled.

If you like this idea, I would be willing to at least try to draft a PR.

[treeman]

One reason this is better than including raw <div> tags is that markdown isn't parsed inside html tags.

I ended up making a workaround using quotes and attributes, kinda like this:

My text
{ :notice }

[Martin1887]

Sorry, but these types of extensions are out of the scope of this project. In the long term, having a plugin system enabling these types of rules to be plugged from external crates would be desirable, but it is not a guaranteed feature and it will take much time.