Mistakes in Web Design (Nielsen)

• Bad Search or Lack of Navigation Support
• PDF Files for Online Reading
• Not Changing the Color of Visited Links
• Non-Scannable Text
• Fixed Font Size
• Page Titles with Low Search Engine Visibility
• Anything that Looks Like an Advertisement
• Violating Design Conventions
• Opening New Browser Windows
• Not Answering Users' Questions
• Using Frames
• Gratuitous Use of Bleeding-Edge Technology
• Scrolling Text, Marquees, and Constantly Running Animations
• Orphan Pages
• Long Scrolling Pages
• Horizontal Scrolling
• Outdated Information
• Overly Long Download Times
• Breaking or Slowing Down the Back Button
• Lack of Biographies or Contact Information
• Outdated or Undated Content
• Broken Links
• Overly Restrictive Form Entry