SVG 1.1 dynamic update tests
Tests dynamic updates of the 'refX' attribute of the SVGMarkerElement object
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS markerElement.getAttribute('refX') is "500"
PASS markerElement.getAttribute('refX') is "5"
PASS successfullyParsed is true
TEST COMPLETE