>>I'm testing both Lianja and Windev in parallel, and it seems they basically do the same thing - run in a webpage. Which then means that any control available on one platform should be available on the others, and would look basically the same. Note that both use .css (as far as I've seen) to render them.
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>CSS3 specifically has some new features so different markup for different devices can be invoked.

Steven Black has applied a simple trick - to check the window width, and then apply this or that stylesheet. That was four years ago, and he said the results were good and the speed too. And actually quite a simple way to test - develop on desktop, resize the browser window, reload, see how it looks.