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SVG allows to use CSS for presentation purpose (like setting filling and stroking colors): https://www.w3.org/TR/SVG11/styling.html#StylingWithCSS But Netbeans report SVG's CSS properties as "unknown", giving a lots of false positive warnings ("Unknown property fill/stroke/stroke-width/..." in Action items view & warnings in CSS file itself). The full list of SVG-CSS properties can be found in the spec's appendix: https://www.w3.org/TR/SVG11/propidx.html → These properties should not be reported as "unknown", and should not appear in the "Action items" view.