We do not have a proper specification ( beside the code ) and Fusion differs between Qt/Quick and Qt/Widgets. It looks the same on all platform what on the flipside makes it alien on probably all mobile platforms.
However it based on QPalette - a concept that works on the desktop.
Qt offers a homebrew designsystem "Fusion": https://doc.qt.io/qt-6/qtquickcontrols-fusion.html
We do not have a proper specification ( beside the code ) and Fusion differs between Qt/Quick and Qt/Widgets. It looks the same on all platform what on the flipside makes it alien on probably all mobile platforms.
However it based on QPalette - a concept that works on the desktop.