To be fair, it's not that bad (I have made a couple of apps based on the webview) - IE11 is a rather decent browser supporting all the niceties from CSS3, flexb

To be fair, it's not that bad (I have made a couple of apps based on the webview) - IE11 is a rather decent browser supporting all the niceties from CSS3, flexbox etc. It's not that different from making layouts for web pages, when you have to support IE11 anyway. All the IE11 pitfalls are covered on stackoverflow, so it didn't feel like wasting much time to make windows version of the app look exactly like linux or macOS.