Javascript Custom Attributes - How many browsers does that work on?

JavaScript
1

I have some attributes that aren’t really standard attributes:

e.g.

<option additional=“34”>Deep Purple</option>

That “additional” attribute is an attribute that I use with Jquery to add an additional price to the item.

How many browsers will work with custom attributes like that? Or will I have to use a standard attribute (Note: if I use Value it overwrites the value inside of the option).

Thanks for any help, hope the question makes sense.

2

It will function in all browsers though the HTML will never be valid. DOJO takes a similar approach… probably why I hate DOJO. That said, a class could probably be used instead.