What Features Should A GUI toolkit have?

[Kagamin via Digitalmars-d]

On Monday, 9 March 2015 at 08:13:47 UTC, Ola Fosheim Grøstad 
wrote:
> Flexibility is also important for creating good UIs. Complex 
> applications never reuse much from existing GUIs, they create 
> their own for all the critical tasks.

They still mostly rely on existing functionality, and I wouldn't 
say it will be easier in HTML5. You will deal with all the same 
primitives, which of course will break with next update.

> HTML5 is an adopted agreed upon standard with backwards 
> compatible enhancements that works cross platform.

Yet, web 2.0 technologies have only rudimentary notion of 
backward compatibility, all it breaks routinely.