Frequently asked questions

It's an extra forceful way of setting the font size, for ebooks that do not behave properly.

Most ebooks use relative font sizes (for the technical people: set using the CSS units rem/em, or even % in some cases). This means that the font sizes in the book say that headers should be for example 120% of the base size, while the main text should be 100% of the base size. In this case, the best way to set a font size is to modify only the base text size of the book (so setting a pixel based size on the root element, for example), then all the different font sizes in the book will grow accordingly. This will, for example, allow the book to make the first letter in a chapter larger than the rest.

In some cases, however, the book styling does not respect the base size, and instead sets text size to something constant on all parts of the text. In these cases, JetReader must use the 'forced' way of overriding the book size (setting a pixel based size on all elements).