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by wging 4030 days ago
You might be surprised. There are conditions under which browsers will impose a 4ms minimum delay when you ask for less. I believe it's when you set a timeout within a timeout.

Edit: close. https://html.spec.whatwg.org/multipage/webappapis.html#timer...

"Timers can be nested; after five such nested timers, however, the interval is forced to be at least four milliseconds."