What is the difference between setTimeout(fn, 0) and setTimeout(fn, 1)?

by

setTimeout has a minimum timeout of 4ms. So there is actually no difference between the two.

If the currently running task is a task that was created by the setTimeout() method, and timeout is less than 4, then increase timeout to 4.

Spec

EDIT: As pointed out by Ahmad in the comments, the spec has changed now, so the answer would currently be, “It depends.”

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