Default browser rendering for h2 onwards:

1. My Book

1.1 The First Section

1.1.1 The First Sub-Section

1.1.1.1 The First Sub-sub-section

1.1.1.1.1 The First Sub-sub-sub-section

1.1.1.1.1.1 The First Sub-sub-sub-sub-section

This is my very first paragraph in this document.

And what browser I am using actually does.