Cover Page

This heading is excluded from the outline (bookmark-level: none) even though h1 defaults to bookmark-level: 1 - it's just a cover page, not a real chapter.

Introduction

This chapter's bookmark label is generated from a counter, not its own heading text (bookmark-label: 'Chapter ' counter(chapter) ': Introduction').

Background

Ordinary h2 bookmark (default bookmark-level: 2, label defaults to content(text) - the heading's own rendered text).

Appendix Notes (collapsed by default)

This h2's bookmark starts collapsed in the reader's outline panel (bookmark-state: closed) - expand it to see its own nested sub-bookmark.

Appendix Note A

Nested under the collapsed Appendix Notes bookmark - stays hidden until that entry is expanded.

Chapter Two

This is where the "Jump straight to Chapter 2" bookmark on the cover page actually points, via -peachpdf-bookmark-target: attr(href) reading its own href.