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> And amp4email starts with `<html 4email>`, with the emoji? seriously? [I cannot even insert this emoji here at HN]

I think I know why they're doing this, actually. It's a clever way of ensuring that any services that send, receive, or interact with AMP mail are Unicode-safe. If they can't include a U+26A1 ("HIGH VOLTAGE SIGN") character in the AMP markup, they'll probably mangle any other non-Latin text too.

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It was brought up a long time ago that it was not valid HTML around the earlier days of the AMP project - https://github.com/ampproject/amphtml/issues/472

It was kept in because it is fun, apparently.

Actually, the spec accepts both `<html emoji-4email>` and just `<html amp4email>`.

You can see what the spec accepts here: https://validator.ampproject.org/#htmlFormat=AMP4EMAIL

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