To maximize the perceived affordance of clickability, color and underline the link text. Users shouldn’t have to guess or scrub the page to find out where they can click.
from Nielsen Norman Group, a pioneer in usability. My blog entries now reflect their guidance. Before, the links were gray all of the time. Now, each link is blue, then red when as you click it, then purple if you’ve visited its destination before.
Nielsen Norman Group’s advice is based on extensive observation. It’s amazing how much one can learn from watching someone use a web application or site. We’ll have more on usability testing.
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