Tags: Internet Explorer Linux Requirements An HTML editor, which may be a text editor. Procedure At the top of your XHTML document, you must include the “DOCTYPE” and XML namespace attributes, such as: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> < html xmlns="http://www.w3.org/1999/xhtml"> Next, the <html>, <head>, <title>, and <body> HTML tags must be included in the page. Nesting order of elements may not be rearranged. Each HTML element/tag must also have a closing tag. HTML tags must also be lowercase, such as: </body> There can only be one root <html> tag. Attributes within HTML tags must also be lowercase and quoted such as: <div class="classname"> Attributes must also be fully formatted like the above <div> element, they cannot be minimized such as: <option selected> More Information N/A