MSRangeCollection
Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The MSRangeCollection object is an array of one or more Range objects.
Remarks
The MSRangeCollection object does not inherit from any class or interface and does not define any members.
See also
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https://developer.mozilla.org/en-US/docs/Web/API/MSRangeCollection