It would be nice to have support for backdrop filters in Qt, especially to implement effect like background blur or the acrylic effect from fluent design:

This effect is super common now. It's possible to be done in QtQuick 2.0 but this is technically complicated, and needs a lot of adaptation depending on the case to keep it performant.

Would be nice to have a way to do it easily in QtQuick so the Scene Graph optimize the effect.

The implementation is coming to web browser (on Firefox you need to enable a config), to have a preview of the css filter please see https://glassmorphism.com/