One thing you misunderstood : You don't specify any absolute measurement when using kiUi from C++. The whole point is to get rid of them. They are calculated

One thing you misunderstood : You don't specify any absolute measurement when using kiUi from C++. The whole point is to get rid of them. They are calculated under the hood. The style gives the necessary hints. And this is done in a way entirely separate from the UI code itself. Think of the C++ code doing what is regularly done in both HTML and Javascript, and the kiUi style sheet as what is regularly done in CSS.