For example, if the style sheet says to use a 12 point Palatino font for the text in the body of a document and Palatino is not an option on the remote system, then the web browser can substitute Times-Roman at the specified font size. Another nice feature of style sheets is the ability to use multiple style sheets. Selectors and Properties Style sheet syntax is simple. In CSS, element and class names are also referred to as selectors. A subclassed element should be listed with a period dividing the tag name from the subclass name.
Style sheets can become quite complex, so it is helpful to include comments.
A comment can occur on a line by itself or following a style sheet entry. At this point you can add more entries to control more aspects of the page presentation, or insert a URL pointing to another style sheet to be used. Locally defined styles take precedence over items redefined in an external style sheet. Styles can be applied more specifically than with every occurrence of a given tag. If a style is specified for an HTML element, all subclassed elements of that type will also assume the style unless a separate style is defined for the subclass.