Re: [xhr] "Synchronous XMLHttpRequest outside of workers i..." (#59)

> They actually do have such effects. I'd welcome a test case showing otherwise, but I think you'll find that the page cannot be interacted with, scrolled, etc. while these dialogs are up.

Indeed, which is the desired behavior for a synchronous call.
When you need such behavior, the alternative is to block all interactions by using DOM/CSS tricks to prevent any interaction.
What is "commonly" argued about is the entire browser entering a "not responding" state, which is not the case for alerts.

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