Hi Michael and thank you for this great idea. I have figured out how to add pwa functionality so that when you add it to your screen it’s in a standalone look by serving a manifest.
So far I’ve only made it standalone display and name but plan to add background color and maybe an icon. Check out the progress at:
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Awesome, @Mr270063 
I’d love to see a screenshot of your demo when it’s done!
Presently every time I open my bookmarklet from my home screen it opens a new tab every time in my browser… it means my browser is often littered with Garage Door tabs 
I’m guessing that creating this as a PWA would prevent this?
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All done. I put a generic icon in there but it’s fine. Check out the process screenshots and code. Feel free to update yours with the new stuff if you like.
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That looks great @Mr270063 - nice upgrade
Thanks for sharing this in the comments of the original project. I’m sure other curious users will find there way here to make use of your upgrades. Nice one 
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