If you’ve ever written technical documentation to use online, you probably started out by creating it directly in HTML (hypertext markup language), so you could drop it directly into your website. You may have used various HTML editors that gave you a real-time but not entirely precise preview, but you’ll have spent plenty of time wrangling with one of HTML’s most annoying characteristics, namely that the so-called “markup” is bulky, and hard to read, and easy to mistype.

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