SVG 1.1 dynamic update tests

Tests dynamic updates of the 'x' property of the SVGFESpotLightElement object

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

PASS spotLightElement.x.baseVal is -30
PASS spotLightElement.x.baseVal is 83
PASS successfullyParsed is true

TEST COMPLETE