The aria-activedescendant attribute must refer to a descendant element. The for attribute does not refer to an allowed target element (expecting: button|keygen|meter|output|progress|select|textarea|input[not(@type='hidden')]). The headers attribute must refer to th elements in the same table. Duplicate map name '' The id attribute on the map element must have the same value as the name attribute. The lang and xml:lang attributes must have the same value. Duplicate ID '' A select element whose multiple attribute is not specified must not have more than one descendant option element with its selected attribute set. The track element label attribute value must not be the empty string. There must not be more than one track child of a media element element with the default attribute specified. The ssml:ph attribute must not be specified on a descendant of an element that also carries this attribute. The scoped style element must occur before any other flow content other than other style elements and inter-element whitespace. The sizes attribute must not be specified on link elements that do not have a rel attribute that specifies the icon keyword. There must not be more than one meta element with a charset attribute per document. For each article element, there must be no more than one time element child with a pubdate attribute For each Document, there must be no more than one time element with a pubdate attribute that does not have an ancestor article element. The attribute must refer to an element in the same document (the ID '' does not exist). The attribute must refer to elements in the same document (target ID missing) The attribute does not refer to an allowed target element (expecting: ). The element must have a attribute. The element must not appear inside elements. The element must have an ancestor element. The element must not appear inside elements.