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i cant find it rn but there was a css crime posted here that did exactly that lol
Iirc it's like double underscores?
Edit: nope, nvm, that's the dumb bold thing.
technically markdown only has emphasis and strong, how they get rendered is a separate decision. Most styles reserve underlines for links. In a chost you can, of course, apply any style that CSS supports to your text (text-decoration: underline)