The original motivation here is trying to explain how to handle punctuation characters. The RFC doesn't seem to acknowledge this problem. event.key exposes printable keys as single-character strings, equal to the printable character. There is no 'kebab-case named' equivalent, you just have to write the character literally in the attribute. In many cases that isn't possible as the character isn't syntactically valid. I'm not aware of any workaround for this, aside from not using the modifier.

I've also changed the existing example. The delete key has special internal handling, so I don't think it's the most suitable choice for an example. page-down illustrates the use of kebab-case. The q example illustrates how the conversion to kebab-case results in letters being matched case-insensitively.