In the attached testcase, clicking on the first link (a static "a href") works, as indicated by the debug output. However the other two links are made quite differently, using jquery and other javascript magic, and when clicking on these, acceptNavigationRequest is not called.

Strangely enough, QWebEngineView::createWindow is called in all cases (and always returns nullptr, in this testcase, the use case being an email client).

The index.html file provided is a reduction of https://git.reviewboard.kde.org/r/128735/, both fail in this testcase, and both work in qtwebengine/examples/webenginewidgets/demobrowser.