function html($value = null) {
      if ($value !== null) {
         $this->setInnerText($value);
      }
		return $this->getInnerText();
	}
function html($value = null) {
      if ($value !== null) {
         $this->setInnerText($value);
      }
		return $this->getInnerText();
	}
Return html code of node
@internal jquery (naming) compatibility
@param string|null $value The value to set or null to get the value.
@see toString()
@return string