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For the <circle>
and the <ellipse>
element, this attribute define the y-axis coordinate of the center of the element. If the attribute is not specified, the effect is as if a value of "0" were specified.
For the <radialgradient>
element, this attribute define the y-axis coordinate of the largest (i.e., outermost) circle for the radial gradient. The gradient will be drawn such that the 100% grad