What purpose do page break markers serve in EPUB?

Page break markers in EPUB serve to structure the content and provide contextual cues within the text. They help ensure that the text is presented in a logical and readable format, particularly for users navigating the document. This is essential in digital reading formats where the flow of content may change based on the device or user settings.

Choosing the correct placement of page breaks can significantly enhance the reading experience by preventing unintended text flows that could confuse readers or make navigation cumbersome. This context is crucial for users, especially those with accessibility needs, as it aids in understanding the organization of the content and allows for easier navigation through chapters or sections without losing track of where they are in the material.

In contrast, other options do not accurately align with the primary function of page break markers. For instance, while they may contribute to visual appeal indirectly, their main role is not enhancing aesthetics. Additionally, page break markers do not specifically indicate the end of chapters since chapters can be structured with different methods in EPUB. Lastly, while managing file size is essential in digital formats, page break markers themselves do not partake in that process. Their primary focus remains on improving the user experience through enhanced readability and navigability.