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Created attachment 147413 [details] screenshot of unmarked ui: prefix Product Version: NetBeans IDE 7.3.1 (Build 201306052037) Java: 1.7.0_51; Java HotSpot(TM) 64-Bit Server VM 24.51-b03 Runtime: Java(TM) SE Runtime Environment 1.7.0_51-b13 System: Linux version 3.11.0-12-generic running on amd64; UTF-8; en_US (nb) See the attached screenshot. When the page is not defined as XHTML but as a HTML5 one, the marking of unused namespaces fails.
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