1 This test verifies that DOM nodes are not garbage collected as long as a node in the tree is referenced from JavaScript.
3 PASS: span should be a Node and is.
4 FAIL: span.parentNode should be a Node but instead is null.
5 PASS: span.firstChild should be a Node and is.
6 PASS: span should be a Node and is.
7 PASS: span.parentNode should be a Node and is.