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TimeRanges - Web APIs | MDN
Several members of HTMLMediaElementnormalized TimeRanges object — which the spec describes as having the following characteristics:
The ranges in such an object are ordered, don't overlap, and don't touch (adjacent ranges are folded into one bigger range). A range can be empty (referencing just a single moment in time).
TimeRanges.lengthRead only
Returns an unsigned long representing the number of time ranges represented by the time range object.
TimeRanges.start()
Returns the time for the start of the range with the specified index.
TimeRanges.end()
Returns the time for the end of the specified range.
