Index - U
| ulist | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| underline | Text.XHtml.Transitional, Text.XHtml | 
| unordList | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| URL | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml | 
| usemap | Text.XHtml.Strict, Text.XHtml.Frameset, Text.XHtml.Transitional, Text.XHtml |