Looks very nice. I'm curious about "no mjml" -- I've worked with authoring tools in related domains and found that separating the serialization format from the output format has some benefits. It manifested in needing to store editing concerns like "this element is locked" in the HTML when it had no business being in the HTML output.

Oh wow, nice, thanks for the MIT License!

How did you reliably determine what works and what doesn’t in “untold combination of os/desktop/mobile clients“? Is there a description of that somewhere?

There is site for that https://www.caniemail.com/ . I don’t use it, even if I work on email marketing software, but I guess it might be useful sometimes.

No malicious intent here but the post says it was submitted by you.

What exactly were you "not expecting"?

wasn't expecting to hit the front page so soon given all the attention towards crowdstrike.

not expecting to be on the front page maybe

the upvotes?

Very nice work and very well deserved the front page #2 spot! Thank you!