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For HTML, spellchecking is enabled, so XHTML files should be spellchecked as well. There should also be the corresponding option under Tools -> Options -> Miscellaneous -> Spellchecker.
fixed in web-main#9d31ec484c3d
Integrated into 'main-golden', will be available in build *201004140201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/9d31ec484c3d User: Marek Fukala <mfukala@netbeans.org> Log: #184035 - Enable spellchecker for XHTML