| Document Type | Namespace Description |
| Transitional | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"> The more forgiving, more backwards-compatible version of XHTML |
| Strict | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"> The more rigorous, more XML-style version of XHTML |
| Frameset | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"> DTD for frames |
| Basic tags | |
| <html> | Creates an XHTML document |
| <head> | Defines the title and other information that is not part of the Web page itself |
| <body> | Defines the Web page itself |
| Head tags | |
| <title> | (mandatory) Defines the page title, usually displayed in the browser's title bar |
| <base href="URI" /> | Defines the base URL for this page |
| Block tags | |
| <p>...</p> | Defines a text paragraph. |
| <br /> | Defines a forced linebreak. |
| <blockquote> | Defines a quoted, indented text block. |
| <h1>...<h6> | Defines a level 1-6 heading. |
| <div> | Defines a page section. |
| <table> | Defines a tabular section. |
| <form> | Defines a Web form. |
| <ol> | Defines an ordered list (1, 2, 3, ...). |
| <ul> | Defines an unordered, bulleted list. |
| <li>...</li> | Defines a list item in an ordered or unordered list. |
| <dl> | Defines a definition list, with terms and their definitions. |
| <dt> | Marks the term to be defined. |
| <dd> | Marks the definition of the term. |
| Text formatting tags | |
| <code>, <tt> | Defines a fixed width font, teletype typewriter style. |
| <em>, <cite>, <i> | Emphasises or cites a text passage, usually using italics. |
| <strong>, <b> | Uses strong, boldface font. |
| <pre> | Defines pre-formatted text, text flow not to be controlled by browser. |
| <font size="#" color="rgb"> | Defines a new font for a text region. |
| Anchor tags (links) | |
| <a href="url"> | Defines a hyperlink to another Web page. |
| <a href="mailto:email@domain.tld"> | Defines a hyperlink to an email recipient. |
| <a name="String"> | Defines an anchor within the page. |
| <a href="#String"> | Defines a hyperlink to an anchor on the same page. |
| Graphics tags | |
| <img src="url" /> | Includes an image from the given URL. |
| <hr /> | Includes a horizontal rule. |
| <hr noshade="noshade" /> | Includes a horizontal rule without a shadow. |
| Table tags | |
| <table> | Defines a table. |
| <tr> | Defines a new table row. |
| <td> | Defines a new table cell. |
| <th> | Defines a new table header cell. |
| Table attributes | |
| <table border="#" width="{#|%}"> | Defines table border in pixels and width in pixels or percent. |
| <tr align="{left|center|right}" valign="{top|middle|bottom}"> | Defines horizontal and vertical alignment of a row. |
| <td align="{left|center|right}" valign="{top|middle|bottom}"> | Defines horizontal and vertical alignment of a cell. |
| <td colspan="#" rowspan="#"> | Defines how many rows or columns a cell should span, default is 1. |
| <td nowrap="nowrap"> | Defines a new table cell. |
| Frame tags | |
| <frameset> | Defines a set of frames. |
| <frameset rows="{#|%|*},{#|%|*}"> | Defines rows in the set, either in pixels, percentage of width, or spanning the rest (*). |
| <frameset cols="{#|%|*},{#|%|*}"> | Defines columns in the set, either in pixels, percentage of width, or spanning the rest (*). |
| <frame src="url" name="String" /> | Defines a frame with a name and the URL for its content. |
| <noframes> | Alternative information for browsers without frame support. |
| Form tags | |
| <form action="url"> | Defines a form. The action is mandatory and indicates the URL to be executed on submission. |
| <select name="String"> | Defines a drop-down box, with enclosing options as items. |
| <select name="String" multiple="multiple" size="#"> | Defines a multi-select box with {size} entries height, with enclosing options as items. |
| <option name="String">value</option> | Defines items in select boxes. |
| <textarea cols="#" rows=#"> | Defines a multiline text field with cols times rows characters. |
| <input type="text" name="String" /> | Defines a single line text entry field. |
| <input type="checkbox" name="String" /> | Defines a checkbox. The text for the checkbox follows the tag. |
| <input type="radio" name="String" value="String" /> | Defines a radio button. The text for the button follows the tag. Buttons with the same name form a group of mutual exclusive buttons. |
| <input type="image" border="#" name="String" src="url" /> | Defines a submit button using an image. |
| <input type="submit" value="String" /> | Defines a submit button using value as the face text. |
| <input type="reset" /> | Defines a button that resets the form to blank entries. |
| Key | |
|---|---|
| # | Integer number, usually pixels, sometimes characters |
| % | Integer percentage value, followed by a percent sign |
| String | String of alphanumeric characters, starting with a letter |
| rgb | Color, specified by name ("black") or as RGB value ("#001122") |
| url | URL, usually http:// or file:// |