This test setting various attributes of a SVG elements to JavaScript null.

TEST SUCCEEDED: The value was the empty string. [tested SVGElement.id]
TEST SUCCEEDED: The value was the empty string. [tested SVGElement.xmlbase]

TEST SUCCEEDED: The value was the string '0deg'. [tested SVGAngle.valueAsString]

TEST SUCCEEDED: The value was the string '0'. [tested SVGLength.valueAsString]

TEST SUCCEEDED: The value was the empty string. [tested SVGScriptElement.type]