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The reason is simply that I wanted it to be as simple as possible, but if it seems to be a common request I could add support for data-attributes! (and yes, it "works" in IE, by using getAttribute())

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i used to use class names to store data types (category is a perfect example). there's a really great reason to do this: you can style your objects based on that type of data without relying on CSS attribute selectors.

that said, i quickly learned that it's better to use data- attributes and copy them into the class when necessary. otherwise you end up with utilities like getCategoryFromClassName()

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