I am getting a "Mobile version not available" modal that wont go away on its own on desktop. I can trick it by making my browser full screen, refreshing, then resizing it back to a half sized window.

Targeting specific viewports is such a wrong way to go about it. Just resize your browser (or use the built in responsive design preview and freely resize that) to see if you reflow in a sane way. A single drag gets you hundreds if not thousands of different widths and aspect ratios tested.

Something doesnt seem right. This website loads fine on Chrome's inspector design previews, but looks broken here:

https://viewport-tester.com/?url=https%3A%2F%2Fespncricinfo....

Getting some CORS errors. E.g. https://www.gnome.org/ fails to load fontawesome icons. And there's an interesting bug where opening mobile menu loads a page.

After clicking on four screen sizes.

> To continue enjoying full, unrestricted use, please sign up for updates.

I don't want to give you my email. Why are you forcing me to?

Thank you for creating this! Impressed by multi-devices at once. Looking forward to seeing how this evolves!

Are the viewports sized with or without browser chrome, like the address bar and bottom bar?

This is brilliant. Thanks for building it.

could this be a replacement for emailonacid's device viewport preview feature?

This reminded me of a very similar one but for the desktop from a few years back. Here you go;

https://responsively.app

Source at https://github.com/responsively-org/responsively-app

Pretty cool stuff!

"Mobile version not available" popup that cannot be closed is such an irony. Next time, test your website with a viewport tester :)