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Filling
......fill=" { none | <color> | <func. iri> }": paints the interior of the given graphical element with the specified color/method. If a path is open and this attribute is not 'none', the path is closed by joining the end with the start.
......fill-rule="{ nonzero | evenodd }": specifies which parts are considered 'inside' and to be painted. To determine if a part is considered 'inside', draw a ray from that point to infinity in any direction. For 'nonzero', starting with zero, add one each time a path segment crosses the ray from left to right and subtract one each time a path segment crosses the ray from right to left. The point is inside if the result is non-zero. For 'evenodd', count the number of path segments that the ray crosses. The point is inside if the number is odd.
(nonzero)
(evenodd)
......fill-opacity="{0.0 to 1.0}": specifies the opacity of the paint for the interior. 0.0 means fully transparent. 1.0 means fully opaque.
......opacity="{0.0 to 1.0}": combines stroke-opacity, fill-opacity, etc.
......visibility="{visible|hidden|collapse}": specifies whether the element is visible.