SVG 1.1 dynamic update tests
Tests dynamic updates of the 'in2' attribute of the SVGFECompositeElement object
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS overComposite1.getAttribute('in2') is "SourceGraphic"
PASS overComposite1.getAttribute('in2') is "off1"
PASS successfullyParsed is true
TEST COMPLETE