I am using InDesign 6 to create ePub books. I want to use my own CSS so in the Export to ePub options I am leaving the setting "Include Style definitions" unchecked. I then list my CSS under additional CSS. When I create the ePub and then examine the files included I see that there are 2 CSSs, mine and one created by InDesign. Why does InDesign create a CSS when the "Inlcude Sytle definitions" is left unchecked?
Moved to InDesign Epub forum.
Because that is the way that CS6 exported EPUB.
EPUB is a fast moving target and has moved way beyond what CS6 can export. With each update from InDesign CS6 to InDesign CC to InDesign CC 2014, and even to the latest update to CC in October, there have been major changes to how InDesign exports EPUB. It no longer does it that way, and you have much more control over the process in InDesign CC.
Because InDesign CS6 is never going to change, it's best to work at modifying what they do export, unless you want to upgrade to InDesign CC.