And the appearance goes into a style sheet. Think of a style sheet as a set of instructions, suggesting to a web browser how to draw a page. This is an important distinction. In technical HTML terms, an element is anything marked up inside HTML tags. The part of a statement which identifies page elements is called a Selector .
Selectors select page elements.
The part of a statement which tells a browser how selected elements should be drawn is called the Declaration . A declaration can contain quite a number of Properties, the individual pieces of style to be applied to the selected element. Here is an example to let you see what I am talking about. This is a single statement , perhaps one of many in a style sheet. The selector is body .