docs: function copyAttributesToBodyCopy(bodyCopy, testingContainer) {
    let attributesToCopy = testingContainer.prop('attributes');
    percyJQuery.each(attributesToCopy, function() {
      // Special case for the class attribute - append new classes onto existing body classes
      if (this.name === 'class') {
        bodyCopy.attr(this.name, bodyCopy.attr('class') + ' ' + this.value);
      } else {
        bodyCopy.attr(this.name, this.value);
      }
    });
  }