I’m working on an in-sim app using the github code as a push in the right direction.
I think the sim uses stripped down browser code to display the gauges and our windows. It is based on Coherent which I have no idea about! (yet)
I’ve been using forms to collect data and I have two big limitations, I can’t use the default html date input types etc; and you need to implement a custom keyboard as when typing in forms the sim events mapped to the button also fire.
As to your issue on stream loading you can use the code here (GitHub - dga711/msfs-webui-devkit: This devkit is a mod and guidance for easier development of WebUI (Panels, MFD..) in Microsoft Flightsimulator 2020.) to see console.log messages, perhaps it would be worth debugging that way???
