What is Reddit's opinion of Responsively?

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Try switching to VW/VH or % units for margins and padding, it can help to alleviate those issues, you can also try responsively.app to check various screen sizes from your PC.

I only needed browserstack to test Safari. Then i found this: https://schepp.dev/posts/running-webkit-on-windows/ for windows and the Gnome Web Browser for linux are sufficient.

Theres also https://responsively.app/ which is nice for screen sizes.

For automated testing, I guess Playwright can do the job, but I've not used it. https://playwright.dev/

There is also a tool called responsively app. https://responsively.app/

This will also show you how your pages display on each kind of device. It was super useful for me when building a portfolio

Check this out for simulating tons of devices at once. https://responsively.app/

I personally don't use rem or em much because the design and typesetting is the most important part of my projects.

>don't want to spend on buying multiple devices.

You do realise that chrome dev tools has the option to select a device to simulate screen size and speed.

Apart from it, I contributed to a tool/app responsively during the summer which solves the responsive part of your problem.

I can't comment on the browser compatibility part.