Beginning CSS: Cascading Style Sheets for Web Design, 2nd ...

Chapter 2: The EssentialsFigure 2-11Disabling portions of a style sheet can be useful if you are trying to track down problematic styles, or ifyou are simply experimenting with different effects.ValuesCSS can become quite complex in terms of what it allows a property’s value to be. Figure 2-5 illustratessome, but not all, of the potential types of values that you see in CSS. In the coming sections I discusseach of the different types of values that CSS allows in greater detail, beginning with keyword values.KeywordsA keyword value is used to invoke a predefined function. For example, red, green, and blue are CSSkeywords, red, green and blue; all have a predefined purpose. Color keywords can be used on anyproperty that accepts a color value. Figure 2-12 shows some examples of keywords in a style sheet.Figure 2-12The keywords in Figure 2-12 are no-repeat, fixed, and lightblue. no-repeat and fixed providethe browser with instructions for how to render the background image. lightblue is a keyword thattells the browser what color the text of hyperlinks should be.31