Thanks again (and sorry for duplicating this thread elsewhere).
Cloud reader has frustrated me as I can't really sandbox anything, and it appears to be using a different default. I want
no indent to be standard.
In a couple of other books a formatted previously, I let <p> remain undefined and it was not a problem on all my devices and every app I tried.
The book I am working on today requires there to be no indents, except in a few specific places. I did have <p> undefined and <p class="indent"> for the few odd occasions I needed it.
This was working a treat until someone tried it on Cloud Reader.