Also consider Pug (formerly called Jade). It's a bit more verbose than Markdown, but it's really nice because you can skip closing tags (it's indent-based like

Also consider Pug (formerly called Jade). It's a bit more verbose than Markdown, but it's really nice because you can skip closing tags (it's indent-based like Python), can use CSS selector syntax (same as Emmet e.g. `div#someId.someClass`), and you can paste in regular HTML and have that work as well. There's also file includes, template syntax like loops/if-statements, inherited templates, inline Javascript syntax, "filters" for including Markdown and other languages, and much more