Think of Darwin classification tree. Nodes are classes, leafs are ids. I have an ID and a Class. I have common properties of a human, but I have my own properties that nobody else has. So HTML names (and CSS selector shortcuts # and .) for these attributes makes perfect sense. Use class for Class and id for unique and only.***
***The only real issue is a legacy bug in JS that creates a global window variables that hold references to the elements with id attributes. But with most modern frameworks that is not a problem, since most of the time you work with VDOM, not DOM.
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Think of Darwin classification tree. Nodes are classes, leafs are ids. I have an ID and a Class. I have common properties of a human, but I have my own properties that nobody else has. So HTML names (and CSS selector shortcuts # and .) for these attributes makes perfect sense. Use class for Class and id for unique and only.***
***The only real issue is a legacy bug in JS that creates a global window variables that hold references to the elements with id attributes. But with most modern frameworks that is not a problem, since most of the time you work with VDOM, not DOM.