Here are some of the semantic map examples that, as a teacher, you can use in your classroom to enhance your students��� vocabulary and improve your teaching strategy. A validation object includes a list of form elements, and rules to validate each against. Other examples of (natively) semantic HTML elements are headings, paragraphs, and landmarks such as header, main, and footer. In addition, you can "teach" older browsers how to handle "unknown elements". When to nest an article inside the section. Many web sites contain HTML code like: