为什么inline-flex元素与clearfix有一个奇怪的空白？ [英] Why inline-flex element with clearfix has a weird white space?

问题描述

在应用清除时，我有一个奇怪的行为 inline-flex 元素。当我为一个具有 inline-flex 显示属性的元素设置了一个clearfix时，会出现一个奇怪的空白区域：

但是当使用 inline-block 行为不同：

我不明白为什么 inline-flex 与 inline-block ..有不同的行为，为什么它有这么奇怪的空间。 p>

  .a，.b {border：1px solid red;}。 -align：center;}。b {display：inline-flex; height：20px; width：20px;}。cf：before，.cf：after {content：; display：table;}。cf：after {clear：both;}  

 < div class =a> < div class =b cf>< / div>< / div>  

JSFiddle演示

解决方案

display：inline-flex

display：inline-flex ，您将建立一个flex容器。

flex容器的初始设置为 flex-direction：row 。

这意味着容器的所有流的子元素-elements）将排成一行。这些子项的显示值（在这种情况下为 table ）被覆盖/忽略， 弹性格式上下文 。

您的flex容器在一行中有两个flex项目（伪元素）：

 < div class =a> < div class =b cf>< / div>< / div>  

b

---

display：inline-block

当您使用 display：inline-block 时，您需要建立 block formatting context 。

尊重子元素的显示属性。

您的具有 display：table 的伪元素是块元素，默认情况下，它占用完整的可用宽度。因此，伪元素正在创建两行：

 。 a，.b {border：1px solid red;}。a {text-align：center;} b {display：inline-block; height：20px; width：20px;}。cf：before，.cf：after {content：x; display：table;}。cf：after {clear：both;}  

 < div class =a> < div class =b cf>< / div>< / div>  

b

---

vertical-align：baseline

因为你的代码的两个版本都使用内联级 display 值，所以调用了 vertical-align 属性，其初始值为 baseline 。

您在下面看到的空白区域如果设置为 display：inline-flex 是由于基准线对齐，则

$ 。

当设置为 display：inline-block 时，您看到的下面的空白 div.b

这里有一个更详细的解释:: http://stackoverflow.com/a/36975280/3597276

---

清除属性

  .cf：{
 clear：both; 
} 
  

您的clearfix方法不是任何空白的来源。

您只需使用 clear 属性即可

9.5.2控制浮动旁边的流程： clear
property

此属性指示元素框

不仅在布局中没有浮动的元素，但是如果存在，则在flex格式化上下文中仍然会忽略 float 和 clear 属性。

3。 Flex容器： flex 和 inline-flex display
values

• float 和清除

不会创建浮动或清除flex项目

I have a weird behaviour of an inline-flex element when applying a clearfix to it. When I set a clearfix to an element which has an inline-flex display property the strange white space appears before it:

But when the inline-block is used the behaviour is different:

I don't understand why inline-flex has a different behaviour than inline-block.. and why it has that weird space.

.a,
.b {
  border: 1px solid red;
}
.a {
  text-align: center;
}
.b {
  display: inline-flex;
  height: 20px;
  width: 20px;
}
.cf:before,
.cf:after {
  content: " ";
  display: table;
}
.cf:after {
  clear: both;
}

<div class="a">
  <div class="b cf"></div>
</div>

JSFiddle Demo

解决方案

display: inline-flex

When you use display: inline-flex, you establish a flex container.

An initial setting of a flex container is flex-direction: row.

This means that all in-flow child elements of the container (including in-flow pseudo-elements) will line up in a row. The display value of these children (table, in this case) is overridden/ignored, in accordance with the rules of a flex formatting context.

Your flex container has two flex items (the pseudo-elements) in one line:

.a,
.b {
  border: 1px solid red;
}
.a {
  text-align: center;
}
.b {
  display: inline-flex;
  height: 20px;
  width: 20px;
}
.cf:before,
.cf:after {
  content: "x";
  display: table;
}
.cf:after {
  clear: both;
}

<div class="a">
  <div class="b cf"></div>
</div>

---

display: inline-block

When you use display: inline-block, you establish a block formatting context.

The display property of child elements is respected.

Your pseudo-elements with display: table are block elements which, by default, occupy the full available width. Hence, the pseudos are creating two rows:

.a,
.b {
  border: 1px solid red;
}
.a {
  text-align: center;
}
.b {
  display: inline-block;
  height: 20px;
  width: 20px;
}
.cf:before,
.cf:after {
  content: "x";
  display: table;
}
.cf:after {
  clear: both;
}

<div class="a">
  <div class="b cf"></div>
</div>

---

vertical-align: baseline

Because both versions of your code use inline-level display values, this calls into play the vertical-align property, who's initial value is baseline.

The white space you are seeing below div.b when set to display: inline-flex is due to baseline alignment.

The white space you are seeing below div.b when set to display: inline-block is due to baseline alignment in combination with the effects of two block element children.

Here is a more detailed explanation:: http://stackoverflow.com/a/36975280/3597276

---

The clear property

.cf:after {
    clear: both;
}

Your clearfix method is not the source of any of the white space. In fact, it's having no effect on your layout and can be safely removed.

You use the clear property only when dealing with floats.

From the spec:

9.5.2 Controlling flow next to floats: the clear property

This property indicates which sides of an element's box(es) may not be adjacent to an earlier floating box.

Not only are there no floated elements in your layout, but if there were, the float and clear properties are nonetheless ignored in a flex formatting context.

3. Flex Containers: the flex and inline-flex display values

• float and clear do not create floating or clearance of flex item, and do not take it out-of-flow.

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