code: function findYearElement(parent, year) {
      var node = parent[0] || parent;
      var years = node.querySelectorAll('[md-calendar-year-body]');
      var yearHeader = year.toString();
      var target;
  
      for (var i = 0; i < years.length; i++) {
        target = years[i];
        if (target.querySelector('.md-calendar-month-label').textContent === yearHeader) {
          return target;
        }
      }
      return null;
    }
docs: Find the `tbody` for a year in the calendar.