How do I get WebGL to work in WebView on UWP with Xamarin.Forms?

I'm very new to Xamarin & am trying to use WebView to display WebGL content on UWP.

All I've tried so far is to include the WebView in my XAML and just specify the Source, WidthRequest & HeightRequest attributes.

But, various WebGL examples sites give different results but all do not display any WebGL content. Some show messages like "Your video card does not support WebGL" (even though it does & WebGL works well in Chrome, Firefox and Edge on this Windows 10 machine) or some others just don't show any graphical content at all (and with no messages to explain why).

Is there some additional configuration required to get WebGL to work? Is it an issue with UWP itself? Or is there some other reason?

Thanks!