Markup Error: Unknown attribute "borderColor". Unable to find attribute

Product: JBuilder

When writing a JSP I receive a Markup Error: 'Unknown attribute" even though the syntax is correct.� Why is this?

Jbuilder uses the HTML 4.01 Transitional DTD.

The definition of which can be found at:

This can be 'overridden by checking the Allow non-standard HTML attribute option which is found under the Tools | Preferences | Editor | Markup Editing Menu.� This will then allow these attributes to be added.