Quote:
Originally Posted by TechieBooks
Aside from that, there's one other part of the KDP guidelines I'd appreciate clarification on and it's this: "When using left or right margin and padding CSS properties, specify the values in percentage (%) instead of em units. This ensures that the margins do not grow too wide with large font sizes and impair reading." |
You can ignore this. The "font resizing" on Kindle apps and Kindle eInk readers is a very weird rescaling that leaves left and right margins and indents alone.
Essentially, if the font size slider is set where a capital "H" is 1/4" high, then you increase it so that the same letter is now 1/2" high (twice as big), then all vertical measurements will also increase by the same factor (2x as large). But, the left and right margins and text-indent remain the same in both cases.
It looks like in this change the root em does not change, and all horizontal measurements appear to still use the root em as a basis, while all vertical measurements get scaled with the font. Even percent measurements, which should be based on the screen height, get scaled.