Quote:
Originally Posted by momoha
Yes indeed... that way I just avoid making the calculation myself 
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Yes, but if are going to write the heigh and width with the property "calc" (dangerous under epub2) is better your first aproximation with <img with="xxx" height="xxx" ... />. The ereader will make the calculations and it will work everywhere. But again, the issue to write for each image its size

I still continue thinking that your best bet is to build two epubs. For Kobo you only need to set a measure (i.e. width: 30% or whatever) and just with a class. And for Google Books, to include the images with my second way of doing it. And so also to employ only one measure, the width, and also with a class.