Many variables aff ect the way users view your Web pages. As an HTML author, your goal should be to code pages that are accessible to the largest audience possible. As you plan your Web site, make the following decisions before implementing your site: Make sure to check for support of new HTML5 elements, and test carefully before adding them to your Web site; Use the HTML5 naming conventions to name the content sections of your site, even if only using them as class or id names. This will help you ease the migration to the new HTML5 page layout elements as they become supported by browsers; Use Cascading Style Sheets. The style enhancements and control off ered by this style language are impressive, but are not evenly supported by older browsers. Implement CSS gradually, testing for browser compatibility as you go; Decide whether to code to the XML standard. If you are starting a new Web site, your best choice is to code to this new standard. If you are working with an existing Web site, decide on the most expedient method for upgrading your existing code to XML standards to ensure future compatibility with new tools and browsers; Use good coding practices by writing standards-based markupthat always includes a document type and content type and is correctly validated; Choose the type of editing tool needed to create your HTMLcode. If you choose a WYSIWYG editor, make sure it creates standards-based code. Avoid sing word-processing programs to create Web pages.