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Marup Validation Service reports 7 errors when using the <embed> element. no attribute "autostart" no attribute "width" no attribute "height" no attribute "src" no attribute "loop" no attribute "repeat" embed element undefined However all these attributes are listed on http://www.w3schools.com/media/media_tagref.asp as valid attributes.
Well, w3schools is not the official specification, you can find the HTML 4.01 specification at http://www.w3.org/TR/html4/ and it does not include the embed element.