Open polyline and path elements are filled as if they were closed with the last point linked to the first point.
The test specifies two polylines and two paths on the page with five points each. One polyline/path closes the shape with the fifth point linking to the first. One polyline/path is open (no link from fifth point to first). Both polylines/paths are filled. The open subpath is placed over the closed one. Test passes if the open subpath fills over the closed path.
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Test passes if two black shapes are shown and no red visible on the page.