73 lines
2.5 KiB
Markdown
73 lines
2.5 KiB
Markdown
---
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id: 587d781e367417b2b2512acb
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title: Lock an Element to its Parent with Absolute Positioning
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用绝对定位将元素锁定到其父级
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---
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## Description
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<section id="description"> CSS <code>position</code>属性的下一个选项是<code>absolute</code> ，它将元素相对于其父容器锁定到位。与<code>relative</code>位置不同，这会从文档的正常流中移除元素，因此周围的项会忽略它。 CSS偏移属性（顶部或底部和左侧或右侧）用于调整位置。具有绝对定位的一个细微差别在于它将相对于其最近<em>定位的</em>祖先被锁定。如果您忘记向父项添加位置规则（通常使用<code>position: relative;</code> ），浏览器将继续查找链并最终默认为body标记。 </section>
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## Instructions
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<section id="instructions">通过将其<code>position</code>声明为<code>absolute</code>将<code>#searchbar</code>元素锁定到其<code>section</code>的右上角。给它每个50像素的<code>top</code>和<code>right</code>偏移。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: '<code>#searchbar</code>元素的<code>position</code>应设置为<code>absolute</code> 。'
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testString: 'assert($("#searchbar").css("position") == "absolute", "The <code>#searchbar</code> element should have a <code>position</code> set to <code>absolute</code>.");'
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- text: '您的代码应该在<code>#searchbar</code>元素上使用50像素的<code>top</code> CSS偏移量。'
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testString: 'assert($("#searchbar").css("top") == "50px", "Your code should use the <code>top</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.");'
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- text: '您的代码应该在<code>#searchbar</code>元素上使用50像素的<code>right</code> CSS偏移量。'
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testString: 'assert($("#searchbar").css("right") == "50px", "Your code should use the <code>right</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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#searchbar {
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}
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section {
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position: relative;
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}
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</style>
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<body>
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<h1>Welcome!</h1>
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<section>
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<form id="searchbar">
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<label for="search">Search:</label>
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<input type="search" id="search" name="search">
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<input type="submit" name="submit" value="Go!">
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</form>
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</section>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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