Lloyd Borrett's Blog
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Try to avoid underlining
Another hangover from the days of the typewriter is the extensive use of underling by some people.
In the days of the typewriter, when bold and italic options were not available, underlining was used for contrast. But now we have so many more, and better looking, ways to emphasise -- bolding, italicising (or both), using a different font, increasing font size etc. -- depending on whether it is a heading, subheading or part of the body text you wish to draw attention to.
The original reason the publishing industry avoided the use of underlining was that it affects legibility by covering the parts of letters that descend below the line.
Of course today, underlining has become an established and very useful way of showing hyperlinks. Thus good practice today would be to reserve the use of underlining for showing hyperlinks.