SVG 1.1 dynamic update tests
Tests dynamic updates of the 'dx' property of the SVGFEDropShadowElement object
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS dropShadowElement.dx.baseVal is 0
PASS dropShadowElement.dx.baseVal is 10
PASS successfullyParsed is true
TEST COMPLETE