https://ec.europa.eu/info/law/law-topic/data-protection_en
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https://www.europarl.europa.eu
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https://www.echr.coe.int has a small, non-intrusive banner about at the bottom (good), but their cookie policy does say they “generate anonymous analytics such as the number of documents downloaded.” Hopefully that’s not per user — if so that’s pretty much best-practice.
But clearly there’s a lot of variation even among EU institutions in how they approach cookie prompts.