This is an additional information for the Introduction to HTML document. Before we move forward, it's important to make sure the body is in good shape, just like a web page where HTML forms the basic structure and CSS is used to add style, like clothes, jewelry, accessories, and makeup. So, brush up on your HTML skills before we focus on the styling part.

References:

• https://www.w3.org/MarkUp/Guide/Advanced.html
• https://htmldog.com/guides/html/advanced/
• https://runestone.academy/ns/books/published/webfundamentals/HTML/advanced.html
• https://www.how-to-build-websites.com/advanced-html.php