Test that the 'linearGradient' and 'radialGradient' elements are neither rendered directly nor via the 'use' element.
The test defines 'linearGradient' and 'radialGradient' elements with a red 'stop' and references them from a 'use' element. 'linearGradient' and 'radialGradient' elements with a red 'stop' are also specified outside of a 'defs' tag as if they were regular graphical elements.
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Test passes if there is no red visible on the page.