@TThy
No. If it's not documented in https://doc.qt.io/qt-5/stylesheet-reference.html#list-of-properties, it does not work. None of your grid-* properties appear there, only gridline-color does.
EDIT I have left this in, because it shows I jumped too soon! The above is for QWidgets. You have QWebEngineView. My bad. So that's proper CSS, and down to the Chromium engine.
I don't know whether your issue might be because you put these properties on <header>? Does it make any difference if you put them on a <div>?
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