Headings with markup

Tests that heading markup gets copied to the sidebar.

Heading with code or italic or bold or ~~strike~~

Basic markup should be copied.

Heading with a link

Probably not super-wise to have headings with links, but at least they shouldn't explode.

Heading with a custom id { #custom-id .custom-class }

Make sure navigation works on a custom id.

Heading with <span>html</span>

What happens if there is inline HTML?