title: UWP: WinJS webview preventDefault not working after Windows update 1703
body: <p>Windows 10 Creators Update 1703 brought a new issue to my UWP app - I use a WinJS webview to open a web page which navigates to "myscheme://blahblah" after some time. I usually listen to MSWebViewUnsupportedUriSchemeIdentified to catch this event, call event.preventDefault(), and parse the "blahblah" part for my usage.</p>
  
  <p>Before update 1703, the web page was displaying properly, but now that I have updated my windows 10 machine, the webview is blank once the page navigates to myscheme://blahblah. Almost as if event.preventDefault() doesnt work anymore. Anyone know how I can find out if any changes in 1703 cause this behavior?</p>