The Library of Congress will gradually adopt new elements of version 4.0, but as of this writing, version 3.2 is the approved version of HTML for use in creating Library Web documents. You may choose to use HTML editing software. HTML editors are programs that help you create HTML documents by providing user-friendly interfaces that often include toolbar buttons for HTML tags. HTML format tags are divided into two sets, logical and physical. Logical tags describe the role that the text plays in the document, such as a citation, a definition, or an emphasized element.
Physical tags indicate the desired appearance of the text, such as bold or italics.
When creating HTML documents, it is important to concentrate on the desired structure of your document rather than its appearance because not all browsers display tags in the same way. You may want to test your HTML document on a variety of browsers to identify problems in your coding that your browser may be tolerating. You can also use HTML Validators to locate syntax and style errors in your HTML documents. Jones, Joseph R. Cascading Style Sheets. Mack, E. Stephen.