html - CSS 选择要打印的内容(媒体查询)

Question

我正在尝试构建打印媒体查询以仅打印屏幕的特定内容:

<div>
  <p>
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
    survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing
    software like Aldus PageMaker including versions of Lorem Ipsum.
  </p>
</div>
<div class='printed-content'>
  <p>
    PRINTED CONTENT
  </p>
</div>

CSS:

body {
  background-color: white;
  color: red;
}

@media print {
  body {
    display: none;
  }
  .printed-content {
    display: block;
  }
}

当我打印时，打印的内容现在正在打印(全部为空)。我确定我遗漏了一些简单的内容，但我无法找出是什么。

JSFiddle here

Answer 1

要隐藏所有与您的选择器不匹配的元素，您可以使用 :not() 伪类。

正如@Dekel 指出的那样，您需要适本地确定范围，例如:

@media print {
    body .wrapper *:not(.printed-content) {
        display: none;
    }
    body .wrapper .printed-content * {
        display: block;
    }
}