Headings and subheadings provide a clear and hierarchical organization of the content for each page of the book.

Objectives

• Improve navigation by presenting content in a structured and logical manner.

Implementation

• Use HTML tags h1, h2, h3, h4, h5, and h6.
• Include at least one h1 on every page.
• Maintain a consistent hierarchy: do not skip heading levels (e.g., an h2 heading should not be followed directly by an h4).

Control

• Verify that an h1 heading is present.
• Ensure that the h1-h6 hierarchy is respected without skipping heading levels.