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A strange differences between OSes and Browsers, is that Browsers need/want to conform to standards.

No-one expects Windows programs to work on macOS or Linux. But with the web that's different.

This is indeed what people expect but it’s still pretty far from true. There are still a bunch of CSS quirks that are vendor specific. Also if you want to have fun read about the history of the innerText API - it even works different in different versions of IE! And wasn’t adopted by Firefox until about two years ago. These are only a few of the myriad mines you dodge when developing a library for the web at large. Have a look at caniuse.com for a journey down a compatibility rabbit hole. :)

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