var verd = document.createElement('div');
  var cand = document.createElement('div');
  
  verd.innerHTML = cand.innerHTML = "test";
  
  verd.style.font = "14px/1.5 Verdana, sans-serif";
  cand.style.font = "14px/1.5 Candara, Verdana, sans-serif";
  
  verd.style.position = cand.style.position = "absolute";
  verd.style.left = cand.style.left = "-100em";
  
  document.body.appendChild(verd);
  document.body.appendChild(cand);
  
  if (verd.offsetWidth == cand.offsetWidth) document.body.className = "verdana";