[css-nesting-1] Example 4 : selectors starting with an identifier

Example 4
However, starting the nested selector with an identifier (a type selector, in other words) is invalid:

Does this only apply to the first selector in a list or to each?

invalid :

div {
  color: red;

  input {
    margin: 1em;
  }
}

valid/invalid? :

div {
  color: red;

  :is(input), textarea {
    margin: 1em;
  }

  & input, textarea {
    margin: 1em;
  }
}

From a parser perspective only the first in the list is important. But from an author perspective this is less obvious.

If you remove :is(input) then you need to modify textarea to make it valid again.

I have no preference here, only need to know what to implement

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