Angularjs. Creation of new elements and attributes. Is it correct?

Question

Angular

I understand that angular extends the declarativeness of html. But is it right in html to create a lot of unknowns, for the validator, elements and attributes? After all for these purposes there is xml.

Answer 1

If we are talking about HTML4 then yes, not good. From the point of view of HTML5, custom elements are common, but in the case of attributes, it is enough to add data-* and everything will be valid again.

Answer 2

If you don't need to support older browsers, good luck.

Answer 3

www.w3.org/TR/custom-elements