Test to check if setBaseAndExtent guard node with null owner document (Bug 31680) On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS sel.anchorNode is null PASS sel.anchorNode is null PASS sel.anchorNode is null PASS sel.anchorNode is null PASS sel.anchorNode is null PASS sel.anchorNode is null PASS sel.containsNode(docType) is false PASS successfullyParsed is true TEST COMPLETE