css/css-shapes/basic-shape-circle-ellipse-serialization.html

<!doctype html>
<meta charset=utf-8>
<title>Serialization of basic shapes</title>
<link rel="help" href="https://drafts.csswg.org/css-shapes/#basic-shape-serialization"/>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
function checkEquals(input, expected) {
    test(function() {
        let div = document.createElement('div');
        div.style.clipPath = input;
        let serialized = div.style.clipPath;
        assert_equals(serialized, expected, input);
    });
}

// Keywords get replaced by percentages in 2-value form
checkEquals("circle(at left bottom)", "circle(at 0% 100%)");
checkEquals("circle(at bottom left)", "circle(at 0% 100%)");
checkEquals("circle(at right calc(10% + 5px))",
            "circle(at 100% calc(10% + 5px))");
checkEquals("ellipse(at left bottom)", "ellipse(at 0% 100%)");
checkEquals("ellipse(at bottom left)", "ellipse(at 0% 100%)");
checkEquals("ellipse(at right calc(10% + 5px))",
            "ellipse(at 100% calc(10% + 5px))");

// Only 2 or 4 value form allowed
checkEquals("circle()", "circle(at 50% 50%)");
checkEquals("circle(0px)", "circle(0px at 50% 50%)");
checkEquals("circle(closest-side)", "circle(at 50% 50%)");
checkEquals("circle(farthest-side)",
            "circle(farthest-side at 50% 50%)");
checkEquals("ellipse()", "ellipse(at 50% 50%)");
checkEquals("ellipse(closest-side farthest-side)",
            "ellipse(closest-side farthest-side at 50% 50%)");


checkEquals("circle(at top 0% right 5px)", "circle(at right 5px top 0%)");
checkEquals("ellipse(at top 0% right 10px)", "ellipse(at right 10px top 0%)");
// Remove defaults like closest-side
checkEquals("circle(closest-side at center)",
            "circle(at 50% 50%)");
checkEquals("ellipse(closest-side closest-side at center)",
            "ellipse(at 50% 50%)");

// don't remove non defaults
checkEquals("circle(farthest-side at center)",
            "circle(farthest-side at 50% 50%)");
checkEquals("circle(10px at center)",
            "circle(10px at 50% 50%)");
checkEquals("ellipse(farthest-side 10px at center)",
            "ellipse(farthest-side 10px at 50% 50%)");
// Ellipse can have 0 radii or two, not one. We cannot
// eliminate a single closest-side if the other is different
checkEquals("ellipse(closest-side farthest-side at 50% 50%)",
            "ellipse(closest-side farthest-side at 50% 50%)");
checkEquals("ellipse(closest-side 10% at 50% 50%)",
            "ellipse(closest-side 10% at 50% 50%)");

// Don't transform nonzero lengths
checkEquals("circle(at right 5px bottom 10px)",
            "circle(at right 5px bottom 10px)");
checkEquals("ellipse(at right 5px bottom 10px)",
            "ellipse(at right 5px bottom 10px)");

// Convert keyword-percentage pairs to plain percentages
// Convert zero lengths to 0%
checkEquals("circle(at right 5% top 0px)", "circle(at 95% 0%)");
checkEquals("ellipse(at right 5% top 0px)", "ellipse(at 95% 0%)");

// Don't transform calcs
checkEquals("circle(at right calc(10% + 5px) bottom calc(10% + 5px))",
            "circle(at right calc(10% + 5px) bottom calc(10% + 5px))");
checkEquals("ellipse(at right calc(10% + 5px) bottom calc(10% + 5px))",
            "ellipse(at right calc(10% + 5px) bottom calc(10% + 5px))");
</script>