ISO defines usability as the “extent to which a product can be used by specified users to achieve specified goals effectively, efficiently and with satisfaction in a specified context of use." User experience design is about designing products to be effective, efficient, and satisfying.
What to Consider
Do not cause pop-ups or other windows to appear and do not change the current window without informing the user.
Do not use nested tables.
Do not use tables for layout.
Graphics For Spacing
Do not use graphics for spacing.
Do not use frames.
Do not use image maps unless you know the device supports them effectively.