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That is a very old version of Sigil, since it is up to 0.7.4. The later versions don't thrash epub3 code so much.
You might be better off using Calibre's standalone editor, which is not focused on any particular version of epub.
You will still have to test, as you are, in a browser, as neither Sigil nor calibre can test this sort of thing. Though if you are aimed for an Apple device, you really will need to test in an Apple device, since there is no reliable emulator even for all devices by a manufacturer.
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