...冻结现象四、如何设置行高（line-height）Line-height:1.5;五、如何设置文章位置（text-align）可选择属性（left middle right）IE6/WINDOW威海,龙岩,芜湖,雅安,榆林,铜川,桂林,梧州,锦州,亳州,驻马店,乌海,
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还有一些额外的可选择行地补充和说明的属性，如：域名、描述。
There are a few additional properties which may be optionally added, such as site_name and description.
就像选择元素和属性一样，也可选择元素中的文本。
Just as you can select elements and attributes, you can select the text within elements.
显示属性默认值是可选择的；图2显示一个银行账户类具有一个名为balance的类型，它的默认值为0。
Showing a default value for attributes is optional; Figure 2 shows a Bank Account class with an attribute called balance, which has a default value of 0.
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