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@evan I am not a fan of extensions, as you know, but that aside — Facebook (and others) are fast to blame the standard for missing functionality they'd like to see when good solutions are possible without changes or extensions to the standard. This is then often met with fundamentalist arguments a la "block them all! They are evil!", making productive discussions next to impossible. So I'll try the pragmatic approach and see if there is a simple solution that I can share.