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Beautiful technical solution. Wouldn’t it depend on all website creators and all browser makers to pretty much commit to changes in their code at the same time, before the first consent banner would actually go away? How do you get them to do that?

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Yes it would require everyone to make changes, but like the other person who responded to your comment it probably wouldn't need to happen at the same time. The point being is that it's probably a bit late now but if this was the original solution proposed by the EU the end result would be a lot cleaner while still taking about the same amount of effort (at the end of the day web developers still had to look at all the cookies they set, categorise them, implement warning banners and then correctly handle responses.

You could do user agent sniffing and skip showing the banner if you know the browser supports cookie purposes.

Of course user agent sniffing tends to cause a lot of problems, so this probably isn't a good idea.

Or just have the browser advertise its support for the extension (e.g. yet another header).

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