1 CONSOLE WARNING: The behavior of importNode() with no boolean argument is about to change from doing a deep clone to doing a shallow clone. Make sure to pass an explicit boolean argument to keep your current behavior.
2 This page tests calling document.importNode(null). If it passes, you'll see a "PASS" message below.
4 caught exception: NotSupportedError: Failed to execute 'importNode' on 'Document': The 1st argument provided is either null, or an invalid Node object.
5 PASS: importNode(null) didn't crash