From the spec (https://github.com/WICG/compression-dictionary-transport#fingerprinting https://github.com/WICG/compression-dictionary-transport#fin...): > The

From the spec (https://github.com/WICG/compression-dictionary-transport#fingerprinting https://github.com/WICG/compression-dictionary-transport#fin...): > The existence of a dictionary is effectively a cookie for any requests that match it and should be treated as such: > * Storage partitioning for dictionary resource metadata should be at least as restrictive as for cookies. > * Dictionary entries (or at least the metadata) should be cleared any time cookies are cleared. Given that, I think it offers no more client tracking possibilities than any other existing web tech (cookies, local storage, etc)..