message: fixed <TypeError: Object doesn't support property or method 'from'> with IE11
diff: @@ -18,7 +18,7 @@ function elemName(elem: HTMLElement): string {
  s.push(elem.id);
  }
  - if (elem.classList) {
  + if (elem.classList && Array.from) {
  s.push('.');
  s.push(Array.from(elem.classList).join('.'));
  } else if (elem.className) {
  