90 lines
4.1 KiB
Markdown
90 lines
4.1 KiB
Markdown
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---
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id: 587d78a6367417b2b2512ade
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title: Create a More Complex Shape Using CSS and HTML
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用CSS和HTML创建更复杂的形状
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---
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## Description
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<section id="description">世界上最流行的形状之一是心形,在这个挑战中你将使用纯CSS创建一个。但首先,您需要了解<code>::before</code>和<code>::after</code>伪元素。这些伪元素用于在所选元素之前或之后添加内容。在以下示例中,使用<code>::before</code>伪元素将矩形添加到具有类<code>heart</code>的元素: <blockquote> .heart :: before { <br>内容:“”; <br>背景颜色:黄色; <br> border-radius:25%; <br>位置:绝对; <br>身高:50px; <br>宽度:70px; <br>顶部:-50px; <br>左:5px; <br> } </blockquote>要使<code>::before</code>和<code>::after</code>伪元素正常运行,它们必须具有已定义的<code>content</code>属性。此属性通常用于向所选元素添加照片或文本等内容。当使用<code>::before</code>和<code>::after</code>伪元素创建形状时,仍然需要<code>content</code>属性,但它被设置为空字符串。在上面的示例中,具有<code>heart</code>类的元素具有<code>::before</code>伪元素,该元素分别生成<code>height</code>和<code>width</code>分别为50px和70px的黄色矩形。这个矩形由于其25%的边界半径而具有圆角,并且绝对位于距离<code>left</code> 5px和高于元素<code>top</code> 50px的<code>top</code> 。 </section>
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## Instructions
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<section id="instructions">将屏幕上的元素转换为心形。在<code>heart::after</code>选择器中,将<code>background-color</code>更改为pink,将<code>border-radius</code>更改为50%。接下来,使用类<code>heart</code> (只是<code>heart</code> )定位元素并填充<code>transform</code>属性。使用-45度的<code>rotate()</code>函数。 ( <code>rotate()</code>工作方式与<code>skewX()</code>和<code>skewY()</code>工作方式相同。最后,在<code>heart::before</code>选择器中,将其<code>content</code>属性设置为空字符串。 </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>heart::after</code>选择器的<code>background-color</code>属性应为粉红色。'
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testString: 'assert(code.match(/\.heart::after\s*?{\s*?background-color\s*?:\s*?pink\s*?;/gi), "The <code>background-color</code> property of the <code>heart::after</code> selector should be pink.");'
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- text: '选择<code>heart::after</code>的<code>heart::after</code> <code>border-radius</code>应为50%。'
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testString: 'assert(code.match(/border-radius\s*?:\s*?50%/gi).length == 2, "The <code>border-radius</code> of the <code>heart::after</code> selector should be 50%.");'
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- text: <code>heart</code>类的<code>transform</code>属性应使用设置为-45度的<code>rotate()</code>函数。
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testString: 'assert(code.match(/transform\s*?:\s*?rotate\(\s*?-45deg\s*?\)/gi), "The <code>transform</code> property for the <code>heart</code> class should use a <code>rotate()</code> function set to -45 degrees.");'
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- text: '该<code>content</code>的的<code>heart::before</code>选择应该是一个空字符串。'
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testString: 'assert(code.match(/\.heart::before\s*?{\s*?content\s*?:\s*?("|")\1\s*?;/gi), "The <code>content</code> of the <code>heart::before</code> selector should be an empty string.");'
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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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.heart {
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position: absolute;
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margin: auto;
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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background-color: pink;
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height: 50px;
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width: 50px;
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transform: ;
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}
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.heart::after {
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background-color: blue;
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content: "";
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border-radius: 25%;
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position: absolute;
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width: 50px;
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height: 50px;
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top: 0px;
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left: 25px;
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}
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.heart::before {
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content: ;
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background-color: pink;
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border-radius: 50%;
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position: absolute;
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width: 50px;
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height: 50px;
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top: -25px;
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left: 0px;
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}
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</style>
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<div class = "heart"></div>
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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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