webview-stack

This is a minimal repro of electron/electron#8505. It demonstrates the recommended workaround (not setting visibility while the webview is loading), but also shows the limitations of this approach.

It seems that:

• In some cases we can't rely on z-index for visibility
  • This can result in webview pages bleeding into one another
• webviews will still render blank white screens, particularly when switching between them quickly or when a switch triggers a navigation