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html - 如何将伪元素设置为段落的标题？

问题描述

我们正在使用 Markdown (Kramdown) 来生成静态网站。对于信息框，我们可以对段落进行注解，得到如下结果：

{:.note .icon-check title="This is a title"}
Lorem, ipsum dolor sit amet consectetur adipisicing elit.

这是转换后的 HTML：

<p class="note icon-check" title="This is a title">
    Lorem, ipsum dolor sit amet consectetur adipisicing elit.
</p>

样式是（SCSS）：

p.note {
  &::before {
    float: right;
  }

  position: relative;

  &[title]::after {
    content: attr(title);
    position: relative;
    top: 0;
    left: 0;
  }
}

.icon::before {
  content: "@";
}

由于我们使用的是 Icomoon 图标字体，其中content设置为:before，因此标题必须为:after。

可以为标题设置绝对定位，但这对于段落文本本身来说太窄了，因为无法设置边距。

这是一个JSFiddle

现在，如何在顶部:after设置一个带有标题的框，在没有设置标题的情况下看起来也不错？

main {
  width: 50%;
  display: block;
  place-items: center;
  margin: auto;
}

p.note {
  border: 3px solid red;
  border-radius: 3px;
  padding: 1em;
  position: relative;
}

p.note::before {
  margin: auto 0 0.5em 0.5em;
  float: right;
}

p.note[title]::after {
  content: attr(title);
  position: relative;
  font-weight: bold;
  top: 0;
  left: 1em;
}

.icon::before {
  font-size: 2em;
  content: "@";
}
<html>

<body>
  <main>

    <p class="note icon" title="This is a title">
      Lorem, ipsum dolor sit amet consectetur adipisicing elit. Dolorem quidem non placeat quibusdam velit, dicta adipisci saepe magnam fuga debitis qui, minima, eius error laboriosam distinctio eos natus et!
    </p>

  </main>
</body>

</html>

它是什么样子的： 在此处输入图像描述 它应该是什么样子的： 在此处输入图像描述

标签： htmlcsscss-positionpseudo-element

解决方案

使用 shape-outside 的疯狂想法。诀窍是在应用浮动的标题中使用 before 和 after 的图标，position:absolute然后 shape-outside 将创建一个特定的形状，以模拟图标周围的浮动行为。

main {
  width: 50%;
  display: block;
  margin: auto;
  text-align:justify;
}

p.note {
  border: 3px solid red;
  border-radius: 3px;
  padding: 1em;
  position: relative;
}

p.note::after {
  margin: auto 0 0.5em 0.5em;
  position:absolute;
  top: 1em;
  right: 0.5em;
}


p.note[title]::before {
  content: attr(title);
  display:block;
  height:3.5em;
  float:right;
  width:100%;
  text-align:center;
  font-weight: bold;
  shape-outside:polygon(0 0,100% 0,100% 100%,calc(100% - 3em) 100%,calc(100% - 3em) calc(100% - 2em),0 calc(100% - 2em));
  /* To illustrate the shape */
  background:
    linear-gradient(rgba(255,255,0,0.3) 0 0) top/100% calc(100% - 2em) no-repeat,
    linear-gradient(rgba(255,255,0,0.3) 0 0) bottom right/3em 3em no-repeat;
  border:1px solid rgba(0,0,0,0.2);
   /**/
}

.icon::after {
  font-size: 2em;
  content: "@";
}

.icon:not([title])::after {
  display:none;
}

.icon:not([title])::before {
  font-size: 2em;
  content: "@";
  margin: auto 0 0.5em 0.5em;
  float:right;
}
<main>

  <p class="note icon" title="This is a title">
    Lorem, ipsum dolor sit amet consectetur adipisicing elit. Dolorem quidem non placeat quibusdam velit, dicta adipisci saepe magnam fuga debitis qui, minima, eius error laboriosam distinctio eos natus et!
  </p>

</main>

<main>

  <p class="note icon" >
    Lorem, ipsum dolor sit amet consectetur adipisicing elit. Dolorem quidem non placeat quibusdam velit, dicta adipisci saepe magnam fuga debitis qui, minima, eius error laboriosam distinctio eos natus et!
  </p>

</main>

或者像下面这样的基本想法：

main {
  width: 50%;
  display: block;
  margin: auto;
  text-align:justify;
}

p.note {
  border: 3px solid red;
  border-radius: 3px;
  padding: 1em;
  position: relative;
}

p.note::before {
  margin: auto 0 0.5em 0.5em;
  float: right;
}

p.note[title]::after {
  content: attr(title);
  position: absolute;
  font-weight: bold;
  top: 0.5em;
  left: 0;
  right:2em;
  text-align:center;
}
p.note[title] {
  padding-top:2em;
}

.icon::before {
  font-size: 2em;
  content: "@";
}
<main>

  <p class="note icon" title="This is a title">
    Lorem, ipsum dolor sit amet consectetur adipisicing elit. Dolorem quidem non placeat quibusdam velit, dicta adipisci saepe magnam fuga debitis qui, minima, eius error laboriosam distinctio eos natus et!
  </p>

</main>

<main>

  <p class="note icon" >
    Lorem, ipsum dolor sit amet consectetur adipisicing elit. Dolorem quidem non placeat quibusdam velit, dicta adipisci saepe magnam fuga debitis qui, minima, eius error laboriosam distinctio eos natus et!
  </p>

</main>

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