Range on which this currentRange is compared to.
@return -1, 0 or 1 depending on whether the correspondingboundary-point of the Range is respectively before, equal to, or after the corresponding boundary-point of sourceRange.
@exception DOMException WRONG_DOCUMENT_ERR: Raised if the two Ranges are not in the same Document or DocumentFragment. detach() has already been invoked on this object.
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