Ul 242 Epub Official

| UL 242 Requirement (Physical) | Metaphorical Equivalent for EPUB | |-------------------------------|----------------------------------| | Load-bearing capacity | Ability to handle large embedded fonts, SVG images, and media overlays without crashing | | Fire resistance | Preservation of semantic structure when converted to other formats (PDF, MOBI) | | Corrosion resistance | Long-term archival stability; no broken internal links after 10 years | | Seismic (shock) resistance | Graceful degradation on old or buggy e-readers (e.g., fallback CSS) | | Material certification | Validation by tools like epubcheck or Ace by DAISY for accessibility |