The HTMLAreaElement.rel property reflects the rel attribute. It is a string containing a space-separated list of link types indicating the relationship between the resource represented by the <area> element and the current document.
A string.
const areas = document.getElementsByTagName("area");
for (const area of areas) {
console.log(`Rel: ${area.rel}`);
}<a> and <link>, HTMLAnchorElement.rel and HTMLLinkElement.rel.HTMLAreaElement.relList