/**
* Create iframe.
*
* @param string $src
* @param string $class
* @param string $id
* @param array $attrs
* @return string
*/
public function render($src, $class = '', $id = '', array $attrs = array())
{
$attrs = array_merge(array('frameborder' => 0, 'content' => null, 'tag' => 'iframe', 'src' => Str::trim($src)), $attrs);
$attrs = $this->_cleanAttrs($attrs);
$content = $attrs['content'];
unset($attrs['content']);
return Html::_('tag')->render($content, Str::trim($class), Str::trim($id), $attrs);
}