Attribute local names with namespace prefixes are not type-checked

[adamjhf]

It's not possible to validate the name of the attribute after a namespace prefix, e.g. when using Alpine JS's x-on prefix:

maud! {
   div x-on:clickk="console.log('I never run due to typo in attribute name')" {}
}

It would be good to have the option to validate these local attribute names, in line with this principle from the hypertext docs:

All macro invocations are validated at compile time, so you can’t ever misspell an element/attribute or use invalid attributes.

[vidhanio]

The issue here is that what is stopping you intentionally firing an event called clickk? Obviously in this case it wouldn't make sense, but one could create/fire custom events which aren't within the set of all built-in JS events which would fail here, despite being valid.

[adamjhf]

I think that's ok so long as it's easily extendible.

We encounter that without namespaces anyway, e.g. hx-target-* attributes in https://htmx.org/extensions/response-targets/ and data-* attributes used by frameworks like Datastar.