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See: http://docs.webplatform.org/wiki/apis/css-regions/Region/getRegionFlowRanges ...which displays this text under "Return Value": Returns an object of type function. Returns a series of Range objects that represent the fragments of DOM content that currently flow into the region. The first "Returns" is auto-generated based on the interface member's identity as a method, and the second is content I wrote. I'd think the reader only wants the return value of obj.method(). The fact that obj.method returns a reference to the function seems pointlessly obvious. You shouldn't have to write the content pedantically as "When called as a method, returns..."