指定值

CSS 属性的**指定值**是它从文档样式表中接收到的值。给定属性的指定值根据以下规则确定

  1. 如果文档的样式表显式指定了属性的值,则将使用该值。
  2. 如果文档的样式表未指定值,但它是继承属性,则该值将取自父元素。
  3. 如果以上都不适用,则将使用元素的初始值

示例

HTML

html
<p>My specified color is given explicitly in the CSS.</p>

<div>
  The specified values of all my properties default to their initial values,
  because none of them are given in the CSS.
</div>

<div class="fun">
  <p>
    The specified value of my font family is not given explicitly in the CSS, so
    it is inherited from my parent. However, the border is not an inheriting
    property.
  </p>
</div>

CSS

css
.fun {
  border: 1px dotted pink;
  font-family: fantasy;
}

p {
  color: green;
}

结果

规范

规范
层叠样式表级别 2 修订版 2 (CSS 2.2) 规范
# 指定值

另请参阅