Get a list of broken links on a page that match a given selector. Uses Fetch API. Assumes cross-origin requests, if any, are allowed by the server.

linkReport.js

function linkReport(selector) {
   'use strict';
   const fetchOptions = {
     method: 'HEAD'
   };
   window.brokenLinks = [];
   document
   .querySelectorAll(selector)
   .forEach(link => {
     fetch(link.href)
     .then(response => {
       if (!response.ok) {
         brokenLinks.push({ href: link.href, text: link.text });
       }
     });
   });
}