将空div设为一行的高度 [英] Make empty div of one line height

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本文介绍了将空div设为一行的高度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

是否可以创建将生成以下HTML的规则:

Is it possible to create a rule that will make the following HTML:

<div style="width: 100%"></div>

仅使用CSS的一行高度,还是我需要放置& ; nbsp; 作为内容?

of one line height using just CSS, or do I need to put &nbsp; as the content?

推荐答案

某些可能性:

line-height 的初始值为 normal ,其使用值取决于实现,但是规范提出一个介于 1.0 1.2

The initial value of line-height is normal, whose used value is implementation-dependent, but the spec suggests a number between 1.0 and 1.2

就我而言(对于带有 font-family的WinXP,FF27: Times new Roman ),该值是 1.25 ,因此您可以使用 height:1.25em 。但是,该值可能与其他字体或实现不同。

In my case (FF27 for winXP with font-family: "times new roman") that value is 1.25, so you could use height: 1.25em. However, that value might be different with other fonts or implementations.

然后,最好手动设置 line-height 的值,例如 line-height:1.25em

Then, it's better to manually set line-height to some value, like line-height: 1.25em.

div {
  border: 1px solid red;
  min-height: 1.25em;
  line-height: 1.25;
}

<div></div>

请注意,如果要仅在没有内容时将这些样式设置为元素,可以使用 :empty 伪类:

Note that if you want to set those styles to the elements only when it has no content, you can use the :empty pseudo-class:

div:empty {
  border: 1px solid red;
  height: 1.25em;
  line-height: 1.25;
}

<div></div>

向元素插入一些内容。

例如,您可以添加普通空间并设置 空白 前包装(或 pre )以防止空间崩溃:

For example, you can add a normal space and set white-space to pre-wrap (or pre) to prevent the space from collapsing:

div {
  border: 1px solid red;
  white-space: pre-wrap;
}

<div> </div>

零宽度空间&#8203;

div { border: 1px solid red; }

<div>​</div><!-- There is a zero-width space inside -->

如您所说,& nbsp; 也可以。但是,它是一个不间断的空间,因此其目的是防止自动换行。然后,使用它在语义上是不正确的IMO。

As you say, &nbsp; would also work. However, it is a non-breaking space, so its purpose is preventing automatic line breaks. Then, using it would be semantically incorrect IMO.

并使用@BoltClock ,这些空格可以插入CSS伪元素,但请注意,这些空格可能不适用于非常老的浏览器。

And as @BoltClock says, those whitespaces could be inserted with CSS pseudo-elements, but note that might not work on very old browsers.

这篇关于将空div设为一行的高度的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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