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The browser isn't for "regular" websites, it's for all websites.

And believe it or not, there are crazy JavaScript bugs that are OS-dependent.

I remember when I was writing a library around the audio API, and the ways it behaved on Chrome were different across Macs, Windows and Android. Detecting the OS with the user-agent string was literally the only way to build code that would work.

Now I've never personally come across that for the CPU architecture, but I certainly wouldn't be surprised if there were behavioral differences between 32-bit and 64-bit processors somewhere that affects some JavaScript function or HTML5 call somewhere.

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