For andy

scrape.js

[].slice.call(document.getElementsByTagName('a')).forEach(function(e){
  var x = new XMLHttpRequest(); 
  x.open("HEAD", e.href, true);
  x.onreadystatechange = function(){
    if(x.status === 200) e.style.setProperty('background-color', 'papayaWhip');
  };
  x.send();
});