Test wholeText and replaceWholeText
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS textB.wholeText is 'AB'
PASS para.textContent is 'ABC'
PASS textB.wholeText is 'XYZ'
PASS para.textContent is 'XYZC'
PASS successfullyParsed is true
TEST COMPLETE