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I went to write the exact same thing. I fear this will only happen more and more once edge becomes chrome... It is a sad state of things.

If something dont work on firefox i just dont use it, i am doing that for some time and it´s been great to me, others should do the same and tell the product owner that, so them make more acessible products from now on

Considering it was a failed product, made open source, I don't think they were necessarily concerned total browser compatibility.

How does this happen when you compile through Babel?

Babel (specifically, babel-preset-env, which I assume you're referring to) only ensures that your code's syntax can run within a given browser. It doesn't make sure all the web APIs and browser features you take advantage of are compatible, or that they produce the same result.

Where are you reading that?

https://pagedraw.io/tutorials/basics

If you visit the linked tool in Safari on OSX that message is what you get.