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The class attribute isn't just for styling though.

See https://html.spec.whatwg.org/multipage/dom.html#global-attri...

> authors are encouraged to use values that describe the nature of the content, rather than values that describe the desired presentation of the content.

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> values that describe the nature of the content vs > rather than values that describe the desired presentation of the content.

Or could it be that the meaning here is that you should write descriptive classes such as 'alert-box' instead of 'red-box'.

But that gets your "not just for styling" property for free — now another component can use the knowledge that the element is an alert box.

TIL! So those obnoxious JavaScript frameworks using classes for declaring logic are actually valid???!!

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