SVG 1.1 dynamic update tests

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

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

PASS spotLightElement.getAttribute('x') is "-30"
PASS spotLightElement.getAttribute('x') is "83"
PASS successfullyParsed is true

TEST COMPLETE