Web Design in a Nutshell, 3rd Edition

The values for each property may be provided in any order and any may be omitted. Keep in mind that omitted properties are reset to their default values in shorthand properties. Be careful not to override list-style declarations earlier in the style sheet. Each of these examples of list-style duplicates the effects of the separate rules provided in the example shown in Figure 23-4.

ul {list-style: url(skull.gif) disc outside;}
ul {list-style: disc outside url(skull.gif);}
ul {list-style: url(skull.gif) disc;}