Header¶
Base class: Fragment
Header is a special fragment that automatically calculates its level.
This means that you will get h1 for the top level, h2 for the next level,
and so on. If you want a specific h1/h2/etc tag use Fragment.
The header level is only increased by the existence of Header objects,
so putting a manual h1 somewhere won’t make the next Header into a
h2 tag.