Underlining
Underlined text is a carryover from the days of the typewriter, when such options as italics and boldface were unavailable. In addition to its aesthetic shortcomings (too heavy, interferes with letter shapes), underlining has a special functional meaning in web documents. Most readers have their browser preferences set to underline links. This default browser setting ensures that people with monochromatic monitors or people who are color-blind can identify links within text blocks. If you include underlined text on your web page, it will certainly be confused with a hypertext link