farthest-side at center top)", "circle(farthest-side at 50% 0%)");
test_valid_value("clip-path", "circle(4% at top right)", "circle(4% at 100% 0%)");

test_valid_value("clip-path", "ellipse()", "ellipse(at 50% 50%)");
test_valid_value("clip-path", "ellipse(1px closest-side)", "ellipse(1px closest-side at 50% 50%)");
test_valid_value("clip-path", "ellipse(at 10% 20%)");
test_valid_value("clip-path", "ellipse(closest-side closest-side at 10% 20%)", "ellipse(at 10% 20%)");
test_valid_value("clip-path", "ellips