The basic element of the Web is a page. HTML tags that govern the appearance of a page are called attributes.
Attributes are parameters that help explain what function the tag or command is to perform.
A more powerful tag is the image tag, which specifies the name of the image to insert within a page. Some attributes supply preferences about the appearance of a specific page element. For example, a table has attributes that describe its border width and the padding or space between cells. Because the HTML format is constantly growing and evolving, browsers are designed to ignore tags, or attributes, they do not understand. Consequently, an older browser can display a page using a later version of HTML, however, it does not display that page as the designer intended.