列表样式类型属性指定目录项标记的类型，并且如果使用列表样式图像是没有的，或者图像加载被关闭。
The list-style-type property specifies the type of list-item marker, and is used if list-style-image is none or if image loading is turned off.
这里的最后三个样式规则对齐文本并应用样式，还为代表下拉列表的嵌入元素提供新的背景图像。
The last three styling rules shown here align and style the text and provide new background images for the embedded items that represent the drop-down lists.
还改变了子列表项的样式，让用来创建符号的背景图像显示为对应的颜色。
The styling for the sub-level list items is also changed so that the background images used to create bullets appear in a corresponding color.
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