Quote:
Originally Posted by DaleDe
You are right that it doesn't always work due to the fact it is a rather new attempt at a solution and as I mentioned is is part of the HTML5 initiative so is not applicable to older devices.
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It is also included in CSS2.1 (
http://www.w3.org/TR/CSS21/syndata.html#length-units):
px: pixel units — 1px is equal to 0.75pt.
At the time of the ePub 2 spec, CSS2.1 was still a working draft, so you are also right that it's not entirely applicable. However, this pixel definition has been in CSS2.1 since 2010.
Anyway, the message is that one can never know what a px will be, even in the absence of bugs.