FYI - I downloaded and installed QupZilla version 2.1.2 (a lightweight Web Browser based on Qt's WebEngine (Chrome's version of WebKit). It is built using Qt 5.8.0.
I then went to the first of your demo sites. It seemed to function just fine as a pop-up.
So it seems that Qt's Webkit is old enough that it will not support the newer pseudo-classes but that Qt 5.8.0 with Chrome's based QWebEngine does seem to support those css3 features.
Sigil will eventually get ported over to Qt's QWebEngine Framework since it is the future.
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