SVG 1.1 dynamic update tests

Tests dynamic updates of the 'maskContentUnits' property of the SVGMaskElement object

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

PASS maskElement.maskContentUnits.baseVal is SVGUnitTypes.SVG_UNIT_TYPE_OBJECTBOUNDINGBOX
PASS maskElement.maskContentUnits.baseVal is SVGUnitTypes.SVG_UNIT_TYPE_USERSPACEONUSE
PASS successfullyParsed is true

TEST COMPLETE