The Spanish guidance is much more relaxed than the ones from UK, France, and Germany – adding to the somewhat different expectations across the EU member states.
incl. also interesting links to other EU papers (e.g. on cloud)
Sadly from Nov 2016, so with GDPR in mind, but not in force, yet.
Covered technologies include
Web caching mechanisms
HTML5 local storage
“Canvas fingerprinting” and “Evercookies”
Enforcement actions by ICO on cookies