Should a PHP script be more expensive than a Ruby script that does the same thing? What are you trying to achieve using HTML5 instead of xHTML? Are you using s

Should a PHP script be more expensive than a Ruby script that does the same thing? What are you trying to achieve using HTML5 instead of xHTML? Are you using specific HTML5 apis? Did your client asks for a special feature that it's only available in HTML5? I would usually do my works in the best technology available and acceptable to my client, but it really depends on your client needs. I would for sure ask more money to make a website IE7 compatible, for instance.