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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
assert_equals(typeof window.screenLeft, "number", "screenLeft type");
assert_equals(window.screenLeft, window.screenX, "alias of screenX");
}, "screenLeft");
test(() => {
assert_equals(typeof window.screenTop, "number", "screenTop type");
assert_equals(window.screenTop, window.screenY, "alias of screenY");
}, "screenTop");
</script>