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Note that by default both "Simple PWA Wrapper" and "Branded Domain Wrapper" both work in iFrame. So your website will be opened in app from within the iFrame, which sometimes can be turned off.
If your website does not allow iFrame, xFrame (in this case your app screen will stay blank after you install it) you have two the options:
1) to allow xFrame option for the mobsted.com domain - ask your web admin for that
2) is to go for Branded Wrapper and choose - "Take it out of iFrame" option in it's settings
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