If you are serious about your web page, you can not just negotiate with what you see, keep in mind your guests are globally, and they use different displays to accessibility your web page – they use even their LCD TV, in 50 inches wide. The following are must have validations that you should require your web page designer to examine.
1.W3C Markup Validation Service
3.W3C CSS Validation Service
4. Link checker
5. Mobile compliance