SVG 1.1 dynamic update tests
Tests dynamic updates of the 'yChannelSelector' attribute of the SVGFEDisplacementMapElement object
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS displacementMap.getAttribute('yChannelSelector') is "B"
PASS displacementMap.getAttribute('yChannelSelector') is "G"
PASS successfullyParsed is true
TEST COMPLETE