Originally Posted by theducks
Do not Depend on something that appears to work in Sigil 
Sigil will tolerate more errors (IMHO allowing any non-spec feature is an error) than the Spec allows.
Then you still need to check your work on Devices because DEVICES do not always support all of the EPUB SPEC.
to wit a 50% <hr /> appears as intended in Sigil/ To get it to appear the same with ADE (MRSDK), you need to fake the center by using a margin-left: 25%
 Do spend some time reading the stickies at the top of formats forums. It will save a lot of hair pulling/  later.
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