[jordanzhninja]

I'm building a Windows Universal App, and at the moment, I'm making the Windows Phone app. I'm debugging using a Nokia Lumia 520 which has a 480px * 800px display.

Because I'm using HTML5 & Javascript instead of XAML to build the app, I'm worried that it might look bad on a 1920*1080 Windows Phone or another Windows Phone with higher resolution. Because I have no way to test this theory, how can I be sure that all Windows Phone's will display my app correctly?

[juamms]

Have you tried debugging with the emulators? there's an option for 1080p screens.

[jordanzhninja]

Have you tried debugging with the emulators? there's an option for 1080p screens.

I need Windows 8.1 Pro to run the Windows Phone emulator. I only have the regular edition of Windows 8.1

[Expression2]

You can always open the html in internet explorer. If you are using vector graphics and dynamic positioning (percentage or ratio based measuring) things should look just right

[0vZ]

You can use Nokia Remote Device service. It's free and it's something like an emulator (or even a real device), running on Nokia servers.
You can upload your app there and test it on different devices.