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Gecko and Blink both implement it.
Ugh, boolean parameter. Could we change the API here instead of speccing it as-is? Range already has intersectsNode(), so if this functionality is desired, I would like to copy the intersectsNode() method to Selection, then add containsNode() to both Range and Selection with no second parameter (only returns true if fully contained). CCing Ryosuke because he was interested in taking over Selection.
Moving to Selection API component.
Added in https://github.com/w3c/selection-api/commit/a79093963522521859679b2d93ff3d28ab4443c8.
Thanks, Ryosuke. I submitted a small IDL fix: https://github.com/w3c/selection-api/pull/10