... X x-height values, 57 XHTML (see also DOCTYPE declarations; elements, XHTML) Dynamic HTML and, 305–306 XHTML 1.0 Recommendation, 36, 71 use in this book, 72 XHTML 1.1 Recommendation, ... table rows, 88, 90, 278 using <span>, 112 horizontal navigation, 186–189 horizontal spacing, text, 125 hover pseudo-class, 28 HTML (see also elements, HTML) CSS validation requirements, ... HTML (see also elements, HTML) CSS validation requirements, 65 font size specification, 100 HTML 4 Recommendation, 36, 71 inheritance tree, 42 semantic markup, 33 text alignment, 114 http-equiv...