85 lines
2.6 KiB
Markdown
85 lines
2.6 KiB
Markdown
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---
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id: 587d781e367417b2b2512acc
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title: Lock an Element to the Browser Window with Fixed Positioning
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用固定定位将元素锁定到浏览器窗口
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---
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## Description
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<section id="description"> CSS提供的下一个布局方案是<code>fixed</code>位置，这是一种绝对定位，可以相对于浏览器窗口锁定元素。与绝对定位类似，它与CSS偏移属性一起使用，并且还从文档的正常流中移除元素。其他项目不再“实现”它所处的位置，这可能需要在其他地方进行一些布局调整。 <code>fixed</code>位置和<code>absolute</code>位置之间的一个关键区别是，当用户滚动时，具有固定位置的元素将不会移动。 </section>
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## Instructions
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<section id="instructions">在代码导航栏标有的一个id <code>navbar</code> 。将其<code>position</code>更改为<code>fixed</code> ，并将其偏离<code>top</code> 0像素和<code>left</code> 0像素。注意到（没有）对<code>h1</code>位置的影响，它没有被按下以容纳导航栏并且需要单独调整。 </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>#navbar</code>元素的<code>position</code>应设置为<code>fixed</code> 。'
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testString: 'assert($("#navbar").css("position") == "fixed", "The <code>#navbar</code> element should have a <code>position</code> set to <code>fixed</code>.");'
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- text: '您的代码应该使用<code>#navbar</code>元素上0像素的<code>top</code> CSS偏移量。'
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testString: 'assert($("#navbar").css("top") == "0px", "Your code should use the <code>top</code> CSS offset of 0 pixels on the <code>#navbar</code> element.");'
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- text: '您的代码应使用<code>#navbar</code>元素上0像素的<code>left</code> CSS偏移量。'
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testString: 'assert($("#navbar").css("left") == "0px", "Your code should use the <code>left</code> CSS offset of 0 pixels on the <code>#navbar</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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#navbar {
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width: 100%;
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background-color: #767676;
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}
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nav ul {
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margin: 0px;
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padding: 5px 0px 5px 30px;
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}
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nav li {
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display: inline;
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margin-right: 20px;
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}
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a {
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text-decoration: none;
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}
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</style>
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<body>
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<header>
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<h1>Welcome!</h1>
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<nav id="navbar">
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<ul>
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<li><a href="">Home</a></li>
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<li><a href="">Contact</a></li>
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</ul>
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</nav>
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</header>
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<p>I shift up when the #navbar is fixed to the browser window.</p>
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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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