Cascading Style Sheet is a web tool that can be utterly necessary if you want to give a professional, qualitative look to your site. It is recommended by W3C , who manages the standards for the Internet, in order to add style (e.g. fonts, colors, spacing, padding, alignment, etc.) to web documents.
The style sheet is more and more used presently due to its usefulness and its advantages that are far from minor: it mainly allows to dissociate the content and the presentation of web pages, which makes them compatible for various browsers, and also
Wide Accessibility
Are your Web pages written for all the major browsers? There was a time when Internet Explorer and Netscape Navigator were the only browsers available. Now there are many browsers competing each other for greater market share. Only the sites that are HTML standard-compliant will appear properly on all browsers.
Validating your HTML code with a HTML Validator tool will increase the accessibility of your site through all the major browsers. This, in turn, will increase the number of visitors to your site.
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HTML
Once you have planned the basis of what your web site is about and created the content the next stage is to code the HTML web pages (you could design XML web pages and other formats, but we won't cover that here). It is possible to code your web pages by hand in a simple text editor like Notepad, but this times a long time and doesn't allow you to view the look of your pages while coding them. Therefore the best way is to use a web page design package such as Macromedia Dreamweaver or Microsoft Frontpage which automatically generate the HTML code (this