Test that appropriate exceptions are thrown when adding children to a ProcessingInstruction.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS pi.appendChild(null) threw exception Error: HierarchyRequestError: DOM Exception 3.
PASS pi.appendChild(div) threw exception Error: HierarchyRequestError: DOM Exception 3.
PASS pi.appendChild(textNode) threw exception Error: HierarchyRequestError: DOM Exception 3.
PASS successfullyParsed is true

TEST COMPLETE