Why should you use CSS & (X)HTML ?

I have added this section to try and give a simple and definitive answer to why sites should now be coded using CSS and (X)HTML. There are many articles on the web, but few seem to spell out an answer in simple / basic terms. In its simplest form:

By using CSS and (X)HTML you seperate content / site layout from design. (X)HTML should be used for the content / site layout and CSS for the design.

That is it in the simplest definition that I can come up with. By structuring your website in this way, you will have a website that

• Is well structured and meaningful
• Coded to best practice techniques
• Minimises coding mistakes
• Makes most use of Search Engine Optimisation
• Is easier to port between different devices (screens, mobile technologies etc)
• Improves Web Accessibilty for all users

In the same way that most of us think little of a buildings foundations, when designing websites often foundations are over looked. However they are an essential component of a well structured and valid website. With good foundations, designing and developing a website is significantly easier; you will have the best possible advantage in getting your website listed in the search engines and you allow all users, those with impaired vision, lower specification computers and those not on broadband to enjoy the experience of viewing your website.