---
id: 587d781b367417b2b2512abb
title: 使用 hr 标签创建水平线
challengeType: 0
videoUrl: 'https://scrimba.com/c/c3bR8t7'
forumTopicId: 301049
dashedName: create-a-horizontal-line-using-the-hr-element
---

# --description--

你可以用 `hr` 标签来创建一条宽度撑满父元素的水平线。 这种水平分割线一般用来表示内容主题的改变，或在视觉上将文档分隔成几个部分。

# --instructions--

在卡片标题元素 `h4` 下方添加一个 `hr` 标签。

**注意：** HTML 中的 `hr` 是自闭合标签，所以我们不需要为它添加结束标签。

# --hints--

应存在一个 `hr` 标签。

```js
assert($('hr').length == 1);
```

`hr` 应在标题和段落之间。

```js
assert(code.match(/<\/h4>\s*?<hr(>|\s*?\/>)\s*?<p>/gi));
```

# --seed--

## --seed-contents--

```html
<style>
  h4 {
    text-align: center;
    height: 25px;
  }
  p {
    text-align: justify;
  }
  .links {
    text-align: left;
    color: black;
  }
  .fullCard {
    width: 245px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin: 10px 5px;
    padding: 4px;
  }
  .cardContent {
    padding: 10px;
  }
  .cardText {
    margin-bottom: 30px;
  }
</style>
<div class="fullCard">
  <div class="cardContent">
    <div class="cardText">
      <h4><s>Google</s>Alphabet</h4>

      <p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
    </div>
    <div class="cardLinks">
      <a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
      <a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
    </div>
  </div>
</div>
```

# --solutions--

```html
<style>
  h4 {
    text-align: center;
    height: 25px;
  }
  p {
    text-align: justify;
  }
  .links {
    text-align: left;
    color: black;
  }
  .fullCard {
    width: 245px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin: 10px 5px;
    padding: 4px;
  }
  .cardContent {
    padding: 10px;
  }
  .cardText {
    margin-bottom: 30px;
  }
</style>
<div class="fullCard">
  <div class="cardContent">
    <div class="cardText">
      <h4><s>Google</s>Alphabet</h4>
      <hr>
      <p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
    </div>
    <div class="cardLinks">
      <a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
      <a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
    </div>
  </div>
</div>
```