1 Make sure the designMode attribute is exposed on non-HTML documents.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS xmlDocument.__proto__ is XMLDocument.prototype
7 PASS xmlDocument.__proto__.__proto__ is Document.prototype
8 PASS xmlDocument.designMode is "off"
9 PASS xmlDocument.designMode = 'on' did not throw exception.
10 PASS xmlDocument.designMode is "on"
11 PASS successfullyParsed is true