The HTMLLinkElement.rel property reflects the rel attribute. It is a DOMString containing a space-separated list of link types indicating the relationship between the resource represented by the <link> element and the current document.

API HTML DOM HTMLLInkElement Property Reference Référence

The HTMLLinkElement.relList read-only property reflects the rel attribute. It is a live DOMTokenList containing the set of link types indicating the relationship between the resource represented by the <link> element and the current document.

API HTML DOM HTMLLInkElement Property Read-only Reference