Test that ProcessingInstruction inherits from CharacterData On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS ProcessingInstruction.__proto__ is CharacterData PASS ProcessingInstruction.prototype.__proto__ is CharacterData.prototype PASS processingInstruction.__proto__.__proto__ is CharacterData.prototype PASS processingInstruction.target is "target" PASS processingInstruction.data is "data" PASS processingInstruction.length is 4 PASS processingInstruction.data is "" PASS processingInstruction.length is 0 PASS successfullyParsed is true TEST COMPLETE