1. Preview web app in different device's frame (iPad only)
2. Customize the content's width (control page margin)
3. Reset style (alignment and font) for the whole page or web app
4. Show text statistics (# of nouns, verbs, etc.) by paragraph, markdown, page and web app
5. Import Blogger: add published date to the content
6. Embed YouTube playlist
7. Support WebP image file
8. Web app style UI enhancement
9. Fix bug for keyboard shortcuts (copy, cut, paste)
10. Bug fix
