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Debugging EPUB Language Tags: How User Feedback Led to a Deep Dive into Kindle's Font Selection Logic
- Red Note users faced issues accessing Chinese fonts on Kindle due to incorrect EPUB language metadata.
- The bug stemmed from websites' improper setting of language attributes affecting Kindle's font selection logic.
- Kindle uses EPUB language tags to select font families, with Chinese fonts available for specific language tags like zh-CN.
- The solution involved implementing smarter language detection by prioritizing user preferences and HTML metadata.
- Technical improvements in v1.4.3 included using native AppKit for drag-and-drop and fixing force update bugs on the server side.
- Library capacity estimation was enhanced by building and compressing EPUB files to accurately estimate sizes.
- Lessons learned emphasized the importance of EPUB standards, platform differences, user feedback, and performance optimizations.
- Upcoming developments in v1.5 focus on content quality, optimization, and cleaner, smaller EPUB files.
- Future plans include enhancing content extraction, EPUB file size optimization, and content cleanup.
- Stay updated with ZinFlow's progress in cross-platform e-book generation by downloading v1.4.3 from the App Store.
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