Button HTML error about interactive-examples

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[Josh-Cena]

The button is purposefully not connected to a form because that's not the intention of this example. Buttons serve thousands of use cases and submitting a form is just one of them. The button here purely shows its "clickable" nature without any script logic.

The extra class seems harmless to remove, but it shouldn't break anything either.

[estelle]

The class attribute takes a space-separated list of class names as its value. While the "favorites" class has no associated CSS styles, the attribute as written is valid, though more verbose than needed.

Closing, as the class attribute value is not an issue.
if you are arguing that one of the three button examples on the page should actually have an action attached, please re-open with a comment or submit a new issue.