@Anachron@Natanox :D thanks... But the sad thing is that it is very hard to convince customers. It becomes harder the bigger they are.
I gave up and try to do my best. But I'm always only one part of a team and others don't care enough. It is the same with accessibility and other areas.
It makes me sad as well. But I've the feeling that most websites I've worked on are not as bad as most websites nowadays, still they aren't as good as they could be. And I always discuss with the customers.
That's probably one reason why I call myself a Backend developer. I am not responsible for the HTML, CSS, JavaScript, Building, etc.