Inserting DocumentFragments should remove all children of the fragment before inserting the children.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
Testing appendChild
PASS mutations.length is 2
PASS mutations[0].addedNodes.length is 0
PASS mutations[0].removedNodes.length is 2
PASS mutations[1].addedNodes.length is 2
PASS mutations[1].removedNodes.length is 0
Testing insertBefore
PASS mutations.length is 2
PASS mutations[0].addedNodes.length is 0
PASS mutations[0].removedNodes.length is 2
PASS mutations[1].addedNodes.length is 2
PASS mutations[1].removedNodes.length is 0
Testing replaceChild
PASS mutations.length is 2
PASS mutations[0].addedNodes.length is 0
PASS mutations[0].removedNodes.length is 2
PASS mutations[1].addedNodes.length is 2
PASS mutations[1].removedNodes.length is 1
PASS successfullyParsed is true
TEST COMPLETE