[simion314]

If only there would be a standard way of doing GUIs in HTML, but if you give the same GUI to be implemented to 10 Web developers you will get really different code, some would write it in HTML and CSS, other would maybe use angular, others would use react or similar, or if the project uses other backend language/frakework you will get different results depending on what PHP,Ruby,.NET,Java framework was used.

In Qt you use the Designer, you need to learn about the layout system if you want to do good UIs, but your GUI is saved in a file and then the c++/python code implements the event handlers and app logic.