83 lines
1.6 KiB
Markdown
83 lines
1.6 KiB
Markdown
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---
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id: 587d78a7367417b2b2512ae2
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cGJqqAE'
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forumTopicId: 301054
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localeTitle: 通过从左到右淡化元素来创建视觉方向
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---
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## Description
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<section id='description'>
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在本关里，你将要改变动画元素的 <code>opacity</code>，使其在到达屏幕右侧时渐隐。
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在展示的动画里，具有渐变背景的圆形元素在 50% 标记的 <code>@keyframes</code> 规则处向右移动。
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</section>
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## Instructions
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<section id='instructions'>
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使用 id 选择器选择 id 为 <code>ball</code> 的元素，在 <code>50%</code> 里添加 <code>opacity</code> 属性并赋值 0.1，使其在向右移动时渐隐。
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</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: '50% 处 <code>keyframes</code> 规则应该设置 <code>opacity</code> 属性值为 0.1 以使其渐隐。'
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testString: assert(code.match(/@keyframes fade\s*?{\s*?50%\s*?{\s*?(?:left:\s*?60%;\s*?opacity:\s*?0?\.1;|opacity:\s*?0?\.1;\s*?left:\s*?60%;)/gi));
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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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#ball {
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width: 70px;
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height: 70px;
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margin: 50px auto;
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position: fixed;
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left: 20%;
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border-radius: 50%;
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background: linear-gradient(
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35deg,
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#ccffff,
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#ffcccc
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);
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animation-name: fade;
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animation-duration: 3s;
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}
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@keyframes fade {
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50% {
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left: 60%;
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}
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}
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</style>
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<div id="ball"></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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```html
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// solution required
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```
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</section>
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