Re: [whatwg/xhr] "Synchronous XMLHttpRequest outside of workers i..." (#230)

Basically, if you use synchronous I/O, you block the event loop and the user cannot do anything else, not even click a button if they accidentally started the current operation and want to go elsewhere.

And what might take a moment for you, might take a long time for the user, depending on their environment. File I/O is pretty far from always being fast.

Duping against #20.

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