I don't think so, unfortunately -- you'll have to make the initial call to get the topic, and then subsequent calls to grab the raw markdown. I don't think we'll be adding a way to retrieve the raw markdown at the topic level because we wouldn't have any use for it.
Extend markdown parser
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I searched and found a TON of different additional parsers, but most of them just aren't updated in a while. If I have time I can look into updating them, or making a better parser.
Anything else besides GFM that is wanted?
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Take a look at this:
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It can be done via a Markdown-it plugin: https://www.npmjs.com/browse/keyword/markdown-it-plugin
Possibly this one: https://www.npmjs.com/package/markdown-it-checkbox
If there's interest, I may consider looking into integration with some plugins from npm...
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Make tables responsive pls : http://www.w3schools.com/howto/howto_css_table_responsive.asp