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Webkit is merely what Sigil uses to render its content. There are many, many different rendering engines for various different epub reading devices and apps.
As a content provider/creator, Sigil has always stressed that you not trust Preview/Book View as the ultimate resource on how your book should look on target devices. You should look at them on as many target devices and apps as you can reasonably afford to do.
As others have mentioned, ADE 2.0 is a fairly good test. Unfortunately, we can't use their RMSDK engine in our opensource Sigil project. Not even if we wanted to (and could afford to license it).
The short answer is that Sigil can't give you what you want in this regard. We use what we have available to us.
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