CSS:不是伪类不起作用

时间：2022-11-29

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问题描述

我正在学习 :not() 伪类，但它没有按预期工作.

我想将除 .mind 之外的所有文本都涂成红色.出于某种原因，这并不能阻止 .mind 元素变红.

:not(.mind) {红色}

<div class='parent'><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='mind'>mind</div><div class='child'>三个</div><div 类='孩子'><p>第一段</p></div></div>

解决方案

记住这一点:

:not() 等价于 *:not()

当 :not() 伪类前面没有选择器时，隐含一个通用选择器:

<块引用>

测试此行为的快速方法是使用不可继承的 border 属性.

在下面的示例中，使用您的选择器，您会注意到边框没有应用到 .mind，并且您的选择器按预期工作:

:not(.mind) {红色;边框底部:1px 虚线黑色；}

<div class='parent'><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='mind'>mind</div><div class='child'>三个</div><div 类='孩子'><p>第一段</p></div></div>

为了您的特定目标:

<块引用>

我想将除 .mind 之外的所有文本都涂成红色.

使用更具体的选择器.

.parent >:没关系) {红色;}

<div class='parent'><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='child'>两个</div><div class='child'>三个</div><div class='child'>一个</div><div class='mind'>mind</div><div class='child'>三个</div><div 类='孩子'><p>第一段</p></div></div>

I am learning about the :not() pseudo class and it is not working as expected.

I want to color all text red except for .mind. For some reason this is not preventing the .mind element from being red.

:not(.mind) {
  color: red
}

<div class='parent'>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='mind'>mind</div>
  <div class='child'>Three</div>
  <div class='child'>
    <p>First paragraph</p>
  </div>
</div>

解决方案

Keep this in mind:

:not() is equivalent to *:not()

When there is no selector prefixing the :not() pseudo-class, a universal selector is implied:

6.2. Universal selector

If a universal selector represented by * (i.e. without a namespace prefix) is not the only component of a sequence of simple selectors selectors or is immediately followed by a pseudo-element, then the * may be omitted and the universal selector's presence implied.

Therefore, the rule you have:

:not(.mind) {
  color: red
}

... is saying apply red color to all elements except the element with the class mind.

Okay, except in this case, the color property is inheritable, so even though the red doesn't get applied to the .mind element, it still gets the red through inheritance from the .parent element.

Here's what the browser is doing:

A quick way to test this behavior is with the border property, which is not inheritable.

In the example below, using your selector, you'll notice that the border doesn't get applied to .mind, and your selector works as you were expecting:

:not(.mind) {
  color: red;
  border-bottom: 1px dashed black;
}

<div class='parent'>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='mind'>mind</div>
  <div class='child'>Three</div>
  <div class='child'>
    <p>First paragraph</p>
  </div>
</div>

To your particular objective:

I want to color all text red except for .mind.

Use a more specific selector.

.parent > :not(.mind) {
  color: red;
}

<div class='parent'>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='child'>Two</div>
  <div class='child'>Three</div>
  <div class='child'>One</div>
  <div class='mind'>mind</div>
  <div class='child'>Three</div>
  <div class='child'>
    <p>First paragraph</p>
  </div>
</div>

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CSS:不是伪类不起作用

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