Check that incorrect number of arguments throw TypeError. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". SVGAnimationElement beginElementAt(float offset) PASS animateElm.beginElementAt() threw exception TypeError: Failed to execute 'beginElementAt' on 'SVGAnimationElement': 1 argument required, but only 0 present.. PASS animateElm.beginElementAt(0) did not throw exception. endElementAt(float offset) PASS animateElm.endElementAt() threw exception TypeError: Failed to execute 'endElementAt' on 'SVGAnimationElement': 1 argument required, but only 0 present.. PASS animateElm.endElementAt(0) did not throw exception. SVGFEDropShadowElement setStdDeviation(float stdDeviationX, float stdDeviationY) PASS dropShadow.setStdDeviation() threw exception TypeError: Failed to execute 'setStdDeviation' on 'SVGFEDropShadowElement': 2 arguments required, but only 0 present.. PASS dropShadow.setStdDeviation(0) threw exception TypeError: Failed to execute 'setStdDeviation' on 'SVGFEDropShadowElement': 2 arguments required, but only 1 present.. PASS dropShadow.setStdDeviation(0, 0) did not throw exception. SVGFEGaussianBlurElement setStdDeviation(float stdDeviationX, float stdDeviationY) PASS gaussian.setStdDeviation() threw exception TypeError: Failed to execute 'setStdDeviation' on 'SVGFEGaussianBlurElement': 2 arguments required, but only 0 present.. PASS gaussian.setStdDeviation(0) threw exception TypeError: Failed to execute 'setStdDeviation' on 'SVGFEGaussianBlurElement': 2 arguments required, but only 1 present.. PASS gaussian.setStdDeviation(0, 0) did not throw exception. PASS successfullyParsed is true TEST COMPLETE