On the Web, use a serif font if the visitor is likely to print the Web page. Just because HTML makes it possible for you to use specified fonts in Web pages, this does not mean that you should specify a particular font.
Many Web designers use the default font, which allows the visitor's browser to choose the font.
If you choose a specific font and your visitors do not have that font on their computer, then the text will appear in the browser's default font. If none of the fonts exist, then the page will use the browser's default font. The minimum recommended font size for Web text is 10 points. Many visitors who have visual problems prefer a font size of 11 or 12 points. Do not use more than two font sizes per Web page.