Longest CSS rule in the page

cssrules.js

(function(j, w) {
  w.call(document.styleSheets).forEach(function(q) {
    try { /* Accessing remote domain cssRules fails. */
      w.call(q.rules || q.cssRules).forEach(function(k) {
        (k.selectorText || '').split(',').forEach(function(b) {
          (b.length > j.length) && (j = b);
        });
      });
    } catch (z) {}
  });
  return j;
})('', [].slice);