TOOLS - CSS: Professional Techniques for Modern Layout - page 5

Figure 1-2: Element layout visualization with Firebug.

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On the right side of the HTML tab, you can see the CSS that applies to the currently inspected
element by clicking the Style tab (see Figure 1-3). h is not only can be the stuf you, the
author, have written, but also the things that the browser itself is applying from its built-in
styles. If you see styles from html.css or quirk.css, for example, those are the built-in styles.
(h ese are called “UA styles,” for user agent styles. You can change whether or not they're
displayed via a pop-up menu from the Style tab.)

One thing to note is that sometimes Firebug will show you properties you didn't specify, like
-moz-background-clip. Unless you're sure you declared those explicitly, you can more or less
ignore them. Also, if you use a shorthand property, it will be expanded out into the individual
properties. h at is to say, something like this:

font: 1em "Andale Mono", "Courier New", Courier, monospace ;

...will be represented in Firebug like this:

font-family: "Andale Mono","Courier New",Courier, monospace ;
font-size: 1em ;
font-size-adjust: none ;
font-stretch: normal ;
font-style: normal ;
font-variant: normal ;
font-weight: normal ;
line-height: normal ;