In the e-book viewer, although I define the width, height and vertical-align of an image in "em" (and not in pixels), when I click on one of the two buttons "bigger" or "smaller", the images don't resize in accordance with the size of the font. It seems that e-book viewer does not update the em when you change the zoom factor (it works well by example in iBooks or Gitden Reader).
Is it a bug or a feature?
Thanks for all.
Denis