I have been playing around with getting to know the epub-format, editing, fixing, testing, etc.
Maybe I am doing something wrong, but I have noticed that centering doesn't work (using Sigil to center the text).
<p style="text-align: center;"><a id="bookmark0"></a><span class="font19" style="font-weight:bold;">text</span></p>
The text get centered in all software viewers I have tried.
Last formatting bug I had was caused by the extended drive. To send the epub as is, is to unmark "Enable Extended Features" for the plugin the correct way?
(Aura, 2.5.2, calibre/extended driver)
(The most annoying bug I have found is for highlighting, everything from a certain point gets highlighted to the end of the chapter...)