This page tests cookie blocking by setting and reading cookies using common HTTP cookie headers. The cookies can be inspected by opening your browser console window and navigating to the "application" tab on Chrome or "Storage" tab on Firefox.
"Lang" is a short cookie which does not contain any tracking information.
"trackingid" is a cookie that will attempt to track you for five years. If successfully filtered, its expiration time should be set to less than 24 hours.
"1P_JAR" is a well-known cookie used to track your browsing activity across many different sites. It should be blocked entirely.