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Try validating an SVG file: http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.w3.org%2FGraphics%2FSVG%2FTest%2F20061213%2Fsvggen%2Fstyling-css-01-b.svg&profile=svg&usermedium=all&warning=1&lang=en Actual results: I/O Error: Unknown mime type : image/svg+xml Expected results: Expected the validator to validate CSS in style attributes and elements as well as external CSS files refereced from SVG. Happens without qs parameter: http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.w3.org%2FGraphics%2FSVG%2FTest%2F20061213%2Fsvggen%2Fstyling-css-01-b.svg&profile=svg&usermedium=all&warning=1&lang=en