与类选择符相似，ID选择符也基于一个属性的值，但这个属性是ID属性。
Like the class, an ID selector is based on the value of an attribute, but in this case, it's the ID attribute.
样式表把属性（可以控制的属性）和值（为这些属性选择的值）与样式选择符联系起来。
The style sheet attaches properties (attributes that you can control) and values (your choices for the attributes) to the style selectors.
样式表把属性（可以控制的属性）和值（为这些属性选择的值）与样式选择符联系起来。
The style sheet attaches properties (attributes that you can control) and values (your choices for the attributes) to the style selectors.
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