It is not at all difficult to create a website with the range of software and help available today. However, it is very important that your web page remains viewable though future version of HTML. This is where the need to validate these HTML documents arises. You can make use of the HTML validator to insure that what you are writing is valid.

Writing a valid HTML document is very important to ensure that it has future compatibility. Browsers are also evolving and support the standard HTML as per the W3C. The browsers may not support all versions of HTML but it becomes easier if they are at least compliant with older versions. By writing non-standard HTML you stand the chance of losing out as browsers improve. All the visitors to your website need not be using the same browser as you are. By considering that all of them use the same browser and coding accordingly, you simply stand to annoy the readers, as some parts may not be visible or readable to some if they are invalid formats. HTML validators can help you by checking your HTML for browser specific entities and also alert you if changes are required. For example ‘iframe’ tag is supported by Internet explorer while Netscape does not support it. Similarly, the ‘marquee’ tag is supported by both but is not a part of the HTML 4 standard. If you are adding a table ensures that it appears the same in all browsers available. What a browser supports right now may not be allowed in the next version. However, if you use valid HTML such a problem would not arise.

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2. Web Standards, Browsers, And Designing For The Future
3. Choosing professional web design templates
4. A Deeper Look At The Science Behind Web Design 2