H1

H2

H3

H4

H5

H6

asterisks underscores. asterisks underscores.

asterisks and underscores.

Scratch this.

1. First ordered list item
2. Another item ⋅⋅* Unordered sub-list.
3. Actual numbers don’t matter, just that it’s a number ⋅⋅1. Ordered sub-list
4. And another item.

I’m an inline-style link with title

No language indicated, so no syntax highlighting. 
But let's throw in a <b>tag</b>.