We are seeing how more and more people are using smartphones (in portrait/vertical orientation) to consume ebooks. Hence, we're experimenting with font sizes in PDF files.
EPUB files are not affected, because the smartphone user has the power to choose the font size, and the text will automatically reflow to correctly fit the screen.
In short, EPUB files protect you from scrolling sideways.
Reflowable ebooks asume, however, that your ebook contains mostly text.
If your ebook has images which require text beside these images, then reflowing will ruin the layout. The same thing applies in the case of tables.
EPUBs work best with stories, because the ebook uses mostly text.
Manny M. Viloria
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