Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/css-parser/webkit-gradient.html 

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
test(function() {
    assert_true(CSS.supports("background-image", "-webkit-gradient(radial, 1% 2%, 3, 4% 5%, 6)"));
}, '-webkit-gradient accepts positive radii.');

test(function() {
    assert_true(CSS.supports("background-image", "-webkit-gradient(radial, 1% 2%, 3, 4% 5%, 0)"));
}, '-webkit-gradient accepts zero radii.');

test(function() {
    assert_false(CSS.supports("background-image", "-webkit-gradient(radial, 1% 2%, -3, 4% 5%, 6)"));
    assert_false(CSS.supports("background-image", "-webkit-gradient(radial, 1% 2%, 3, 4% 5%, -6)"));
    assert_false(CSS.supports("background-image", "-webkit-gradient(radial, 1% 2%, -3, 4% 5%, -6)"));
}, '-webkit-gradient rejects negative radii.');
</script>