find on a page all links with a pathname you care about

links-elements-of-interest.js

const pathnamesOfInterest = ['of-interest', 'also-of-interest'];

/*
// if IE11 didn't need to be supported

elsOfInterest = [...document.querySelectorAll('a')];
  .filter(el => {
    let pathname = '';
    if (el.href) {
      const url = new URL(el.href);
      pathname = url.pathname;
    }
    const ofInterest = pathnamesOfInterest.includes(pathname);
    return ofInterest;
  });
*/

elsOfInterest = [...document.querySelectorAll('a[href]')];
  .filter(el => {
    const pathname = el.href.split('?')[0].replace(/\/$/, '').split('/').pop();
    const ofInterest = pathnamesOfInterest.includes(pathname);
    return ofInterest;
  });