使元素和祖父母一样宽 [英] Make an element as wide as the grandparent

问题描述

我有以下标记，其中 #content 宽80％，并包含 .slide 元素。我想要幻灯片与他们的祖父母一样宽（即在这个例子中的身体）。这是我有且无法更改的标记：

I have the following markup where #content is 80% wide and contains .slide elements. I want the slides to be as wide as their grandparent (i.e. body in this example). This is the markup I have and it cannot be changed:

body {
  margin: 0;
  font: medium monospace;
  background: lightgray;
}
#content {
  margin: auto;
  width: 80%;
  background: white;
}
#content:before,
#content:after {
  content: "";
  display: table;
}
.slide {
  height: 6em;
  background: indianred;
}

<div id="content">
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
  <blockquote>
    <p>Phasellus euismod dolor imperdiet!</p>
  </blockquote>
  <div class="slide">Donec mauris tellus</div>
  <p>Pellentesque sit amet venenatis diam, at interdum tortor.</p>
  <ul>
    <li>Quisque ornare mi in pharetra porttitor.</li>
    <li>Nulla ultrices quam nec vehicula porta.</li>
  </ul>
</div>

：

• 相对绝对定位，需要修正幻灯片的高度（幻灯片包含可变长度文字）


• 在段落而不是内容上设置80％的宽度，但这不是优雅（内容包含的元素不能有80％宽度或10％左边距）

推荐答案

如果您的周边内容可以自行要求不同的定位属性组合，那么您可以随时使用以下内容。

If your surrounding content can demand a different combination of positioning properties on their own, you could always go with the following.

body {
  margin: 0;
  font: medium monospace;
  background: lightgray;
}
#content {
  margin: auto;
  width: 80%;
  background: white;
}
#content:before,
#content:after {
  content: "";
  display: table;
}
.slide {
  height: 6em;
  background: indianred;
  width: 125%; /*100*(100/80)*/
  margin-left: 50%;
  transform: translateX(-50%);
}

<div id="content">
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
  <div class="slide">Donec mauris tellus</div>
  <p>Pellentesque sit amet venenatis diam, at interdum tortor.</p>
</div>

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