Use of Suitable Font and Adequate Font Size
Best practice is to use the most readable fonts. It is generally best to use standard fonts that are available on most end users device. Do not use multiple font on the same webpage. Use of multiple fonts can create a confusing visual layout making it difficult for users with reading disorders, learning disabilities and attention deficit disorders.
Fonts designed especially for on-screen viewing
Fonts like Verdana, Tahoma, Trebuchet MS and Georgia were specifically developed for use in electronic media and most commonly used in website development.
Adequate Font Size
There is generally no specific Font Size requirement. The default font size must be large enough to be readable by the majority of users. Although various system uses different font sizing, the critical requirement is the size of the text as rendered on-screen. Generally the minimum font size should be 12 points
Sample of Font Sizes:
This sentence is in 14 Points Font
This sentence is in 12 Points Font
This sentence is in 10 Points Font
This sentence is in 8 Points Font