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No interactivity! The email must be printable as-is. Not even CSS code to change styles when you hover over links. That's what I would for a minimum HTML for emails standard that's widely supported.

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It’s actually a bummer: you can’t use a <style> tag because some email clients don’t like them. Instead, you have to inline your styles in every element. the lack of :hover is just a side effect of that I think (although it plays out nicely here).

(While on it, can we also ban loading images from third-party servers?)

you sure can if we resolve to make a text editor instead of a web browser!

Hmm, that might not be a bad idea! We could ban CSS altogether: just leave some markup tags, maybe whatever you can do in Markdown + tables. No colors, no small print, no images. (We could even use something like gemtext as the format instead of HTML, but that wouldn’t be backward compatible with clients.)

But I don’t see any email clients with somewhat significant market share going through with this :(

I'm confused, we're talking about browsers, and comment I replied to suggested 'email + interactivity' as a standard for minimal browsers. I wasn't suggesting adding JS execution to emails. (I don't even allow remote images personally.)

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