EPUB export with common settings fails validation
If you specify in EPUB (Reflowable) Export Options that CSS should be "Relative" instead of "Fixed," InDesign adds unnecessary "absolute positioning" attributes to the CSS which fails EPUB 3.x validation. If you change it to Fixed, then the images resize incorrectly.
Yes, this problem needs absolutely to be fixed.
Laura Carter commented
This is extremely troublesome, especially in the book I'm currently working on that has 72 images with captions. It was frustrating to learn that after finally getting the images just right, with captions not clipping off at the bottom (seemingly the biggest challenge), that every one of those image/caption groupings had an absolute positioning error. I'm not sure where to go from here without distorting the images. Is rasterizing the captions and exporting as Fixed the only solution right now?
That is a recurrent and very very annoying bug, indeed. A nightmare everytime I produce an epub with images inluded in the text.
The above bug is a nightmare and does look like Adobe have dropped the ball.
Margaret Hunter commented
Thanks for raising this, Anne-Marie. I really want to be able to say to my clients that I use InDesign to produce their ebooks because it's the best tool, so I hope this changes.