MDN’s new design is in Beta! A sneak peek:

Type: one of the values below
A determinedprogressmeter is used in cases where you know how long an operation will take. An undeterminedprogressmeter can be used when you don't and will typically be drawn as a spinning barber pole.
The progress meter uses its value attribute to determine the amount of the bar that is filled in.
The progressmeter is indeterminate.

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