The letter after - is uppercased, and the - is removed. So, `div.dataset.MyCoolAttribute`.

Won't that clash in this case, with the version that has double hypens?

I'm talking about your example with double hyphens. It's the initial double hyphen that causes the first letter to be uppercase.

> I'm talking about your example with double hyphens. It's the initial double hyphen that causes the first letter to be uppercase.

I was asking about the initial example, and made a mistake in the question I asked.

To clarify, according to the standards, what do the following transformations result in?

    data-my--cool-data
    data-my-cool-data

el.dataset['my-CoolData'] and el.dataset.myCoolData respectively