> And Gecko isn't embeddable.

This is "In Review"[1], whatever that means.

[1] https://connect.mozilla.org/t5/ideas/ability-to-embed-gecko-...

Mozilla has been working on embedding Gecko since 2005. In practical terms, it can't be done.

I'd be glad to be proven wrong.

There are: GeckoView and Gecko Embedded, so it's doable.

Which roughly nobody uses.

But it's doable.

Blink is the backing engine of Chromium.

And therefore Chromium isn't a browser engine and shouldn't be listed there.