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http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.whatwg.org%2Fstyle%2Fspecification&profile=css3&usermedium=all&warning=1&vextwarning=&lang=en Parse Error @page { margin: 1cm 1cm 1cm 1cm; } http://www.w3.org/TR/CSS21/page.html#page-box