With modern HTML it's actually pretty easy to use markdown wherever you like. Though there is no built-in markdown element, they have built in the ability for a

With modern HTML it's actually pretty easy to use markdown wherever you like. Though there is no built-in markdown element, they have built in the ability for authors to define custom elements. You can define your own custom <mark-down> element and put your mark down syntax inside and as it is, as source code it's nice and human readable even if we didn't do anything further. But we can also define how this element should render, and so it's very straightforward work to wire up any existing "markdown to HTML" library in JavaScript to consume the markdown contents of the tag and display rendered HTML. This is so easy to do, not just for markdown, but almost anything you could want to embed or work with in HTML.