Note that Web users can set their own default type fonts and type sizes in the browser preferences window. The important consideration for Web design is to communicate the message clearly and accurately. Allowing spelling and grammar errors to occur in the text may cause readers to question the authoritative nature of the Web site as a whole. When viewing text on a computer monitor the sans serif type fonts are preferable. This is because serif type fonts tend to look messy when displayed on a monitor.
Computer monitors have low resolution, resulting in aliasing.
Aliasing causes serif type to look jagged. People read by recognizing the overall shape of words, not by interpreting each letter. Words formed with capital letters become monotonous rectangles that offer few distinctive shapes to catch the reader's eye. Therefore, it is useful to test your text layout on browsers running on both operating systems. Cartographic convention often dictates certain standards to be followed with respect to the use of type on maps.