[w3ctag/design-reviews] WG Revision: EPUB 3.4 (Issue #1216)

toshiakikoike created an issue (w3ctag/design-reviews#1216)

### Specification

https://www.w3.org/TR/epub-34/

### Explainer

https://w3c.github.io/epub-specs/epub34/overview/

### Links

- Specification URLs:
    - EPUB 3.4: https://www.w3.org/TR/epub-34/
    - EPUB Reading Systems 3.4: https://www.w3.org/TR/epub-rs-34/
    - EPUB Accessibility 1.2: https://www.w3.org/TR/epub-a11y-12/
- Change log URLs:
    - EPUB 3.4: https://www.w3.org/TR/epub-34/#change-log
    - EPUB Reading Systems 3.4: https://www.w3.org/TR/epub-rs-34/#change-log
    - EPUB Accessibility 1.2: https://www.w3.org/TR/epub-a11y-12/#change-log
- Tests: https://w3c.github.io/epub-tests/
- Security and Privacy self-review: https://github.com/w3c/epub-specs/blob/main/epub34/explainers/EPUB34-security-privacy-self-review.md
- Previous TAG Reviews: #684 and #816.

### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

### Where and by whom is the work is being done?

- GitHub repo: https://github.com/w3c/epub-specs/
- Primary contacts:
    - Toshiaki Koike (@toshiakikoike), Voyager Japan
    - Wendy Reid (@reidmore-online), W3C Invited Expert
    - Brady Duga (@bduga), W3C Invited Expert
    - Gautier Chomel (@gautierchomel), EDRLab
- Organization/project driving the specification: W3C EPUB Working Group


### Feedback so far

EPUB 3.3 was previously reviewed and signed off by the TAG in #684 and #816. This new version, EPUB 3.4, is a maintenance update. 
Key changes based on previous feedback and WG consensus:
- Simplification: 
  - We removed several under-utilized attributes (primarily related to layout) that were often ignored by Reading Systems to better align with actual user-controlled experiences.
  - Dropped font obfuscation, which had been criticized in previous reviews.
- Architecture: 
  -  Emphasis on the layered security model: EPUB inherits security from W3C Web standards and leverages the security features of modern WebViews used in Reading Systems.

### You should also know that...

Key new features include:
- Roll Layout: Introduction of roll layout support, enabling "Webtoons" and similar vertical-scroll content within EPUB.
- Annotation Exchange: Support for exchanging annotations between Reading Systems (Note: This specific feature is currently in First Public Working Draft and will be subject to a separate, more detailed TAG review later).

Other improvements:
- Accessibility and Standards: Further refinements for accessibility and improved alignment with modern Web Platform standards.

We have prioritized backward compatibility and ensured there are no breaking changes to the Web architecture.

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