From http://www.w3schools.com (Copyright Refsnes Data)
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If your web pages conform to the web standards, it improves the quality of your web site.
XHTML is a reformulation of HTML 4.01 in XML.
Writing your pages to the latest HTML 4.01 standard, brings you as close as possible to the XHTML standard.
Using Cascading Style Sheets (CSS) is the preferred way of separating content from style in quality web pages.
With CSS, you can store all style information for your web site in one single document.
All major browsers have support for both the CSS 1 and CSS 2 standards.
Using CSS will improve the quality of your web site and increases the readability for many different browsers. It will also greatly reduce your web site development costs.
A validator is a software program that can check your web pages against the web standards.
When using a validator to check HTML, XHTML or CSS documents, the validator returns a list of errors found, according to your chosen standard.
Make sure you make it a habit to validate all your web pages before publishing.
Read more about page validation.
WAI stands for the "Web Accessibility Initiative", and is initiated by W3C.
WAI's goal is to increase the accessibility of the Internet through six primary areas of work: technology, guidelines, tools, education, research, and development.
You can improve the quality of your web site, and make your information available to more people (and browsers) by writing your pages according to the WAI guidelines.
You will learn more about WAI in a later chapter of this tutorial.
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From http://www.w3schools.com (Copyright Refsnes Data)