Function addLinkToHead

addLinkToHead(
    rel: string,
    href: string,
    doc?: null | Document,
    id?: null | string,
): void
Adds a link node to the head of the document.

The charset is hardcoded to UTF-8 and the type is text/css.
Parameters
- rel: string
  String that represents the rel attribute of the link node.
- href: string
  String that represents the href attribute of the link node.
- doc: null | Document = null
  Optional parent document of the link node.
- id: null | string = null
  unique id for the link element to check if it already exists
Returns void
- Defined in util/domUtils.ts:339