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Checking http://dev.w3.org/html5/spec-author-view/spec.html causes the CSS validator to report: (line 42) Value Error : content leader(". ") is not a content value : leader(". ") (line 53) Value Error : content leader(". ") is not a content value : leader(". ") The CSS at those lines looks like this: #table-example-1 tbody td:first-child::after { content: leader(". "); } .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") } The "leader" value for the "content" property is part of the "CSS Generated Content for Paged Media" spec: http://www.w3.org/TR/css3-gcpm/#leaders