h(x) = abfd9390202a2bcca30aee73cfab7f4fcdff2fda9f9812ba373b0c4ec9536bef
author: unknown
h(x) looks like a cryptographic hash, and refreshing the page shows it changes every 5s. We find that the SHA256 hash of the unix time (floored by 5 seconds) gives us the same hash. Thus the answer is the current unix time (and values within ± a minute are accepted).