blocks|key|2655589|text|我会尝试将文本放入另一个元素中，您知道(或设置)该元素的大小。然后设置它的相对位置，顶部，左侧50%25和负的左右边距。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2655590|See+this+Fiddle|offset|length|2655591|唯一的问题是，这依赖于一个已知/固定的文本块。如果文本是可变的，恐怕您将不得不求助于Javascript。|2655592|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/YKh8P/1/^0|0|0|F|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

<p>I'd try putting the text inside another element, of which you know (or set) the size. Then setting relative positioning to it, top, left 50% and negative left and right margins.</p>

<p><a href="http://jsfiddle.net/YKh8P/1/" rel="nofollow">See this Fiddle</a> </p>

<p>The only problem is that this relies on a known/fixed textblock. If the text is variable, I'm afraid you will have to resort to using Javascript..</p>


blocks|key|4779731|text|这是另一种垂直居中元素的方法。我在一段时间前遇到了this+technique。基本上，它使用了一个伪元素和vertical-align:+Mid.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4779732|.block::before+{
++content:+'';
++display:+inline-block;
++height:+100%25;
++vertical-align:+middle;
++margin-right:+-0.25em;+/*+Adjusts+for+spacing+*/
}

/*+The+element+to+be+centered,+can
+++also+be+of+any+width+and+height+*/+
.centered+{
++display:+inline-block;
++vertical-align:+middle;
++width:+300px;
}|code-block|syntax|javascript|4779733|entityMap|0|LINK|mutability|MUTABLE|url|http://css-tricks.com/centering-in-the-unknown/^0|P|E|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>Here's another way to center an element vertically. I came across <a href="http://css-tricks.com/centering-in-the-unknown/" rel="noreferrer">this technique</a> some time ago. Basically it uses a pseudo element and vertical-align: middle.</p>

<pre><code>.block::before {
  content: '';
  display: inline-block;
  height: 100%;
  vertical-align: middle;
  margin-right: -0.25em; /* Adjusts for spacing */
}

/* The element to be centered, can
   also be of any width and height */ 
.centered {
  display: inline-block;
  vertical-align: middle;
  width: 300px;
}
</code></pre>


blocks|key|4779750|text|关于超链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4779751|关于主菜单中的链接我遇到了这个问题。因为它是<li>标签中的<a>，所以我需要一些表面来使链接是可点击/可触摸的(参见touch+target+size)。所以我所做的就是为<ul>设置一个固定的高度(在本例中是通过它的父级)，<li>-s是它的一个百分比，<a>-s有一个最小高度和行高属性设置给它们，从那里很容易设置顶部。代码：|offset|length|style|CODE|4779752|.menu-header-main-container{
position:+fixed;
top:+0;
bottom:+160px;
}++++
.menu-header-main-container+ul.menu+{
++++++++++height:+100%25;+}
++++++++++.menu-header-main-container+ul.menu+li+{
++++++++++++height:+33.33%25;
++++++++++++max-height:+110px;+}
++++++++++++.menu-header-main-container+ul.menu+li+a+{
++++++++++++++line-height:+40px;
++++++++++++++min-height:+40px;
++++++++++++++top:+calc(50%25+-+20px);
++++++++++++++position:+relative;+}+}|code-block|syntax|javascript|4779753|entityMap|0|LINK|mutability|MUTABLE|url|https://developers.google.com/web/fundamentals/accessibility/accessible-styles^0|0|M|4|U|3|2F|4|36|4|3L|3|1N|H|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@$D|16|E|17|1|18]]|A|$]]|$1|H|3|I|5|J|7|19|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<p>Regarding hyperlinks:</p>

<p>I was having this problem regarding links in main menu. And since it was <code>&lt;a&gt;</code> in <code>&lt;li&gt;</code> tags I needed some surface for the links to be clickable/touchable(see <a href="https://developers.google.com/web/fundamentals/accessibility/accessible-styles" rel="nofollow noreferrer">touch target size</a>). 
So what I did was for the <code>&lt;ul&gt;</code> I set a fixed height(through it's parent in this case), the <code>&lt;li&gt;</code>-s are a percentage of it and the <code>&lt;a&gt;</code>-s have a min-height and line-height properties set to them and it's easy from there to set the top. The code:</p>

<pre><code>.menu-header-main-container{
position: fixed;
top: 0;
bottom: 160px;
}    
.menu-header-main-container ul.menu {
          height: 100%; }
          .menu-header-main-container ul.menu li {
            height: 33.33%;
            max-height: 110px; }
            .menu-header-main-container ul.menu li a {
              line-height: 40px;
              min-height: 40px;
              top: calc(50% - 20px);
              position: relative; } }
</code></pre>


blocks|key|2655670|text|既然已经是2019年了，你也可以使用flexbox来实现这一点:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2655671|为此，请将以下类添加到父元素：|2655672|display:+flex;
flex-direction:+column;
justify-content:+center;|code-block|syntax|javascript|2655673|查看此Fiddle|offset|length|2655674|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/jm6txa18/1/^0|0|0|0|3|6|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<p>Since it's 2019 already, you could also use flexbox to achieve this :)</p>

<p>To do so, add the following classes to the parent element:</p>

<pre><code>display: flex;
flex-direction: column;
justify-content: center;
</code></pre>

<p>See this <a href="http://jsfiddle.net/jm6txa18/1/" rel="noreferrer">Fiddle</a></p>


blocks|key|3136667|text|如果仅使用CSS，则不能将行高设置为父元素高度的100%25。相反，您可以使用CSS将元素垂直居中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3136668|​|3136669|.parent+{
+++height:150px;
+++position:relative;
+++border:1px+solid+#FDD;
}
.position-center+{
++++position:absolute;
++++top:50%25;
++++transform:translateY(-50%25);
}|code-block|syntax|javascript|3136670|<div+class="parent">
++<span+class="position-center">I+am+vertically+centered+element</span>
</div>|3136671|3136672|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>You cannot set the line-height to 100% of the parent element's height with only CSS. Rather, you can use CSS to center an element vertically.</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.parent {
   height:150px;
   position:relative;
   border:1px solid #FDD;
}
.position-center {
    position:absolute;
    top:50%;
    transform:translateY(-50%);
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="parent"&gt;
  &lt;span class="position-center"&gt;I am vertically centered element&lt;/span&gt;
&lt;/div&gt;</code></pre>
</div>
</div>
</p>


<p>I have a responsive element where it's width and height will both scale. Inside this I have some text which I want to center vertically.</p>

<p>How can I set the text's <code>line-height</code> to be the same as it's parent if I don't know the parent's height?</p>

<p><code>line-height: 100%</code> is relative to the font's regular height so this doesn't help...</p>


Set line-height as a percentage relative to the parent element

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个响应式元素，它的宽度和高度都会缩放。在这里面我有一些我想要垂直居中的文本。如果我不知道父文本的高度，如何将文本的line-height设置为与其父文本相同？line-height: 100%是相对于字体的常规高度的，所以这没有帮助...

问将line-height设置为相对于父元素的百分比
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问将line-height设置为相对于父元素的百分比EN