You can have button actions today by wrapping the button in a form tag. The article even shows this. The implication seems to be somehow that this is no good because what if you're already in a form tag? The answer is to move the two actions which aren't actually related to the form outside of the form tag and give them their own unique form parents.
The proposal has an in-depth explanation of why this and other workarounds (like using the `form` attribute and a bunch of dangling forms) aren't sufficient.[0]
[0] https://triptychproject.org/proposals/button-actions#existin...