Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/geometry/WebKitCSSMatrix.html

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<!DOCTYPE html>

<title>Geometry Interfaces: WebKitCSSMatrix</title>

test(() => {

assert_true('WebKitCSSMatrix' in self, 'WebKitCSSMatrix should exist');

assert_true('DOMMatrix' in self, 'DOMMatrix should exist');

assert_equals(WebKitCSSMatrix, DOMMatrix, 'interface object');

assert_equals(WebKitCSSMatrix.prototype, DOMMatrix.prototype, 'prototype');

}, 'Equivalence test');

['WebKitCSSMatrix', 'DOMMatrix'].forEach(interf => {

test(() => {

const desc = Object.getOwnPropertyDescriptor(self, interf);

assert_equals(desc.value, self[interf], 'value');

assert_true(desc.writable, 'writable');

assert_true(desc.configurable, 'configurable');

assert_false(desc.enumerable, 'enumerable');

assert_equals(desc.get, undefined, 'get');

assert_equals(desc.set, undefined, 'set');

}, `Property descriptor for ${interf}`);

});

</script>