HTML 元素与合法的 Doctype
按功能类别排列
下面的表格列出了所有的 HTML/XHTML 元素，并定义了每个元素可以出现在哪种文档类型声明 (DTD) 中 。
| 标签 | HTML 4.01 / XHTML 1.0 | XHTML 1.1 | ||
|---|---|---|---|---|
| Transitional | Strict | Frameset | ||
| <a> | Yes | Yes | Yes | Yes |
| <abbr> | Yes | Yes | Yes | Yes |
| <acronym> | Yes | Yes | Yes | Yes |
| <address> | Yes | Yes | Yes | Yes |
| <applet> | Yes | No | Yes | No |
| <area /> | Yes | Yes | Yes | No |
| <b> | Yes | Yes | Yes | Yes |
| <base /> | Yes | Yes | Yes | Yes |
| <basefont /> | Yes | No | Yes | No |
| <bdo> | Yes | Yes | Yes | No |
| <big> | Yes | Yes | Yes | Yes |
| <blockquote> | Yes | Yes | Yes | Yes |
| <body> | Yes | Yes | Yes | Yes |
| <br /> | Yes | Yes | Yes | Yes |
| <button> | Yes | Yes | Yes | Yes |
| <caption> | Yes | Yes | Yes | Yes |
| <center> | Yes | No | Yes | No |
| <cite> | Yes | Yes | Yes | Yes |
| <code> | Yes | Yes | Yes | Yes |
| <col /> | Yes | Yes | Yes | No |
| <colgroup> | Yes | Yes | Yes | No |
| <dd> | Yes | Yes | Yes | Yes |
| <del> | Yes | Yes | Yes | No |
| <dfn> | Yes | Yes | Yes | Yes |
| <dir> | Yes | No | Yes | No |
| <div> | Yes | Yes | Yes | Yes |
| <dl> | Yes | Yes | Yes | Yes |
| <dt> | Yes | Yes | Yes | Yes |
| <em> | Yes | Yes | Yes | Yes |
| <fieldset> | Yes | Yes | Yes | Yes |
| <font> | Yes | No | Yes | No |
| <form> | Yes | Yes | Yes | Yes |
| <frame /> | No | No | Yes | No |
| <frameset> | No | No | Yes | No |
| <h1> to <h6> | Yes | Yes | Yes | Yes |
| <head> | Yes | Yes | Yes | Yes |
| <hr /> | Yes | Yes | Yes | Yes |
| <html> | Yes | Yes | Yes | Yes |
| <i> | Yes | Yes | Yes | Yes |
| <iframe> | Yes | No | Yes | No |
| <img /> | Yes | Yes | Yes | Yes |
| <input /> | Yes | Yes | Yes | Yes |
| <ins> | Yes | Yes | Yes | No |
| <isindex> | Yes | No | Yes | No |
| <kbd> | Yes | Yes | Yes | Yes |
| <label> | Yes | Yes | Yes | Yes |
| <legend> | Yes | Yes | Yes | Yes |
| <li> | Yes | Yes | Yes | Yes |
| <link /> | Yes | Yes | Yes | Yes |
| <map> | Yes | Yes | Yes | No |
| <menu> | Yes | No | Yes | No |
| <meta /> | Yes | Yes | Yes | Yes |
| <noframes> | Yes | No | Yes | No |
| <noscript> | Yes | Yes | Yes | Yes |
| <object> | Yes | Yes | Yes | Yes |
| <ol> | Yes | Yes | Yes | Yes |
| <optgroup> | Yes | Yes | Yes | Yes |
| <option> | Yes | Yes | Yes | Yes |
| <p> | Yes | Yes | Yes | Yes |
| <param /> | Yes | Yes | Yes | Yes |
| <pre> | Yes | Yes | Yes | Yes |
| <q> | Yes | Yes | Yes | Yes |
| <s> | Yes | No | Yes | No |
| <samp> | Yes | Yes | Yes | Yes |
| <script> | Yes | Yes | Yes | Yes |
| <select> | Yes | Yes | Yes | Yes |
| <small> | Yes | Yes | Yes | Yes |
| <span> | Yes | Yes | Yes | Yes |
| <strike> | Yes | No | Yes | No |
| <strong> | Yes | Yes | Yes | Yes |
| <style> | Yes | Yes | Yes | Yes |
| <sub> | Yes | Yes | Yes | Yes |
| <sup> | Yes | Yes | Yes | Yes |
| <table> | Yes | Yes | Yes | Yes |
| <tbody> | Yes | Yes | Yes | No |
| <td> | Yes | Yes | Yes | Yes |
| <textarea> | Yes | Yes | Yes | Yes |
| <tfoot> | Yes | Yes | Yes | No |
| <th> | Yes | Yes | Yes | Yes |
| <thead> | Yes | Yes | Yes | No |
| <title> | Yes | Yes | Yes | Yes |
| <tr> | Yes | Yes | Yes | Yes |
| <tt> | Yes | Yes | Yes | Yes |
| <u> | Yes | No | Yes | No |
| <ul> | Yes | Yes | Yes | Yes |
| <var> | Yes | Yes | Yes | Yes |
注释：“文档类型声明”的英文译文是 doctype declaration。