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Yes, that's a pretty common layout use of an empty div. Don't see how it gets you out of using css though - the class "pause" would have to be defined in the stylesheet as something like:
.pause{
padding-top:1em;
}
in order to have any effect - and that's css!
Sure, code it as an empty element, neither FlightCrew, EpubCheck or Kindle Previewer seem to care. If you decide to run Cleanup in Sigil, and it wants it to have a closing tag, no-one except you will ever know. I like minimal code too, but life's too short!
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