They do not replace HTML but rather enhance it. They give you more control over your pages. They provide traditional desktop publishing capabilities. For the first time you can harness white space and truly use it to make your pages more readable and attractive for all people but especially for people with vision impairments. This document is an example of increased line and paragraph spacing.
Style sheets are plain text even though the text appears enhanced on the screen.
Thus they can be read by screen reading software while being visually attractive. At the same time, cascading style sheets save you time because you can specify a master style sheet for your entire site. You not only save yourself coding in the body of your pages but you save yourself from recoding individual pages on your site. The browsers that support style sheets are Netscape 4 and Internet Explorer 3 and 4. This short article will not attempt to teach style sheets.