On: The text/markdown media type

[brute]

To quote rule #10 of Butterick's Practical Typography[1][2]:

Never use un­der­lin­ing, un­less it’s a hyperlink.

[1] http://practicaltypography.com/summary-of-key-rules.html

[2] http://practicaltypography.com/underlining.html

[Pxtl → brute]

Users want what they want. I'm using markdown for a question text within an Android questionnaire system, and my users are MDs who don't like to be told "no, underlining is a bad idea", so our markdown is littered with <u></u>