Headlines

Input

= First headline level with =-character =
== Second ==
=== Third ===
==== Fourth ====
... (up to "Sixth")

Display

First headline level with =-character

Second

Third

Fourth

... (up to "Sixth")

If a headline isn't displayed correctly, it is usually because:

there are invisible spaces after the concluding =-character.
the number of =-characters at the front and at the back doesn't match.