/**
* @throws RunTimeException when content as already been added
* @param string $name
* @param string $value default null
* @return ScriptTag
*/
public function addAttribute($name, $value = null)
{
if ('src' === $name && !$this->isEmpty()) {
$err = 'can not add a source attribute to a script with content';
throw new RunTimeException($err);
}
return parent::addAttribute($name, $value);
}
