PageSpeed Google https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Faltair.port4olio.info%2F&tab=desktop https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Faltair.port4olio.info%2F&tab=mobile HTML Validation https://validator.w3.org/nu/?doc=http%3A%2F%2Faltair.port4olio.info%2F&showoutline=yes css Validation http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Faltair.port4olio.info%2F&profile=css3&usermedium=all&warning=1&vextwarning=&lang=de
