Staging beta4 content (15.5.2017), install binaries and webengine from split components, compile project webengine/quicknanobrowser, try to launch, fails with following error (on linux):
QML debugging is enabled. Only use this in a safe environment.
QQmlApplicationEngine failed to load component
qrc:/ApplicationRoot.qml:65 Type BrowserWindow unavailable
qrc:/BrowserWindow.qml:81 Element is not creatable.
ASSERT: "!isEmpty()" in file /home/joaijala/data/Qt/Qt5.9.0_tc_update/5.9/gcc_64/include/QtCore/qlist.h, line 345
Fails also on macOS.