Per our migration plans, I just enabled markdown.it at Meta.
It is an excellent CommonMark compliant engine. I expect quite a few edges to be found during this period of testing.
Do not open bugs about the new Engine, just reply here.
I/we will be updating the top post here with the list of issues and striking out stuff as it is fixed.
Current known issues (to be fixed)
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Onebox vanishes after you start typing and works not-super consistently -
pending approval does not render
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Quote without preceding empty line does not work.
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Onebox of reply is missing tons of info and not rendering right
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When quoting the composer sometimes inserts a
quoteblock in the middle of a line (not a new bug but broken with new engine) -
Onebox bypass is not working
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Table is not showing up styled in preview
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Details composer toolbar generating inline details
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Emoji → Image conversion (when posing Emoji’s via a phone) is not implemented yet.
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2 polls in a post seems to be … not that good.
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Sanitizer stripping out right align style for tables
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Some BBCode is unimplemented:
[email],[url],[code]and[img] -
somelink - Just another link on the internet | somelink
fails cause of the tag/category plugin -
Mention after paragraph is strange
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Can add any oneboxes after an IMG tag
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:email, class_name: is not an emoji
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https://medium.com/@nicksantos not autolinked
New features
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All of this: CommonMark Spec
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Support for GFM tables per: Organizing information with tables - GitHub Docs (enabled by default)
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Support for a basic “typographer” see: https://markdown-it.github.io/ to enable set
enable_markdown_typographerto true
Issues that will not be fixed
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Mixing inline and multiline BBCode will no longer be supported.
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Core will not implement
[ul][ol]and[li]support for BBCode cause it is a recipe for failure.
This topic is wiki, if you are TL3 or above feel free to clean it up.