P3: Somewhat important In QQuickWebEngineView, when you open a new window from JavaScript, the newViewRequested signal gives you a QQuickWebEngineNewViewRequest instance with an empty requestedUrl.
Example:
QUrl url("data:text/html,<html><body>test</body></html>");
QQuickWebEngineView *view = new QQuickWebEngineView();
connect(view, &QQuickWebEngineView::newViewRequested, this, [this, url](QQuickWebEngineNewViewRequest *request){
qDebug() << "Expected " << url;
qDebug() << "Received " << request->requestedUrl();
});
view->loadHtml("<html><script>window.open('" + url.toString() + "');</script></html>");
QSignalSpy spy(view, &QQuickWebEngineView::newViewRequested);
spy.wait();
delete view;
The example prints
Expected QUrl("data:text/html,%3Chtml%3E%3Cbody%3Etest%3C/body%3E%3C/html%3E")
Received QUrl("")