<base taget="_blank">
<iframe name="fr1" id="fra1" frameborder="0" src="ifr.php" sandbox='allow-forms allow-scripts'></iframe>
<a href='www.google.es' target='_blank'>enlace</a>
windows.open('www.google.es','_blank')
<!DOCTYPE html><html lang="es"><head><title></title></head><body><iframe name="fr1" id="fra1" frameborder="0" src="ifr.php" sandbox='allow-forms allow-scripts'></iframe></body></html>
<!DOCTYPE html><html lang="es"><head><title></title></head><body><a href='www.google.es' target='_blank'>enlace</a></body></html>
sandbox='allow-forms allow-scripts'