Can multiple different HTML elements have the same ID if they're different elements?

Question

Can multiple HTML elements have the same ID if they\'re of different element types? Is a scenario like this valid? Eg:

div#foo
span#foo
a#foo

Answer 1

Is it possible to have more than one student in a class having same Roll/Id no? In HTMLid attribute is like so. You may use same class for them. e.g:

And so on.