When you create an HTML frameset using the FRAMEBORDER=”0″ attribute, the frames look fine in Internet Explorer. However, there’s an unsightly white gap between non-white pages when you view the frameset in Netscape Navigator. That’s because Netscape doesn’t support the attribute. Instead, it wants to see BORDER=”0″ to do the same thing.Here’s an example of a frameset that looks right in both major browsers:
When rendering HTML tags, browsers generally ignore attributes that they don’t understand.