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[ BUILD # : 201110100600 ] [ JDK VERSION : 1.6.27 ] The CSS Style Builder, in the background tab has a feature to generate scroll behavior. Here under the scroll, there is a background-attachment: none. This is not a standard CSS value for the property and Netbeans incorrectly generates this. Reference: http://www.w3.org/TR/css3-background/#the-background-attachment
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss