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A CSS formatting rule consists of two parts—the selector and the declaration (or in most cases, a block of declarations). The selector is a term (such as p , h1 ,a class name, or an id) that identifies the formatted element, and the declaration block defines what the style properties are. In the following example, h1 is the selector, and everything that falls between the braces ( {} ) is the declaration block: h1 { font-size: 16 pixels; font-family: Helvetica; font-weight:bold; } An individual declaration consists of two parts, the property (such as font-family ) and value (such as Helvetica ). In the previous CSS rule, a particular style has been created for h1 tags: the text for all h1 tags linked to this style will be 16 pixels in size, Helvetica font, and bold. The style (which comes from a rule, or a collection of rules) resides in a place separate from the actual text it’s formatting—usually in an external style sheet, or in the head portion of an HTML document. ...

Cascading Style Sheets (CSS) is a collection of formatting rules that control the appearance of content in a web page. Using CSS styles to format a page separates content from presentation. The content of your page—the HTML code—resides in the HTML file, and the CSS rules defining the presentation of the code reside in another file (an external style sheet) or in another part of the HTML document (usually the head section). Separating content from presentation makes it much easier to maintain the appearance of your site from a central location because you don’t need to update every property on every page whenever you want to make a change. Separating content from presentation also results in simpler and cleaner HTML code, which provides shorter browser loading times, and simplifies navigation for people with accessibility issues (for example, those using screen readers). CSS gives you great flexibility and control over the exact appearance of your page. With CSS you can control many...