79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
109 lines
3.0 KiB
Markdown
109 lines
3.0 KiB
Markdown
---
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id: 587d78a8367417b2b2512ae6
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title: Animate Multiple Elements at Variable Rates
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cnpWZc9'
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---
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## Description
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<section id='description'>
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In the previous challenge, you changed the animation rates for two similarly animated elements by altering their <code>@keyframes</code> rules. You can achieve the same goal by manipulating the <code>animation-duration</code> of multiple elements.
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In the animation running in the code editor, there are three "stars" in the sky that twinkle at the same rate on a continuous loop. To make them twinkle at different rates, you can set the <code>animation-duration</code> property to different values for each element.
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</section>
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## Instructions
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<section id='instructions'>
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Set the <code>animation-duration</code> of the elements with the classes <code>star-1</code>, <code>star-2</code>, and <code>star-3</code> to 1s, 0.9s, and 1.1s, respectively.
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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: The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.
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testString: assert($('.star-1').css('animation-duration') == '1s', 'The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.');
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- text: The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.
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testString: assert($('.star-2').css('animation-duration') == '0.9s', 'The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.');
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- text: The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.
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testString: assert($('.star-3').css('animation-duration') == '1.1s', 'The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.');
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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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.stars {
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background-color: white;
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height: 30px;
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width: 30px;
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border-radius: 50%;
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animation-iteration-count: infinite;
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}
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.star-1 {
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margin-top: 15%;
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margin-left: 60%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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.star-2 {
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margin-top: 25%;
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margin-left: 25%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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.star-3 {
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margin-top: 10%;
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margin-left: 50%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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@keyframes twinkle {
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20% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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#back {
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position: fixed;
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padding: 0;
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margin: 0;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
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}
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</style>
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<div id="back"></div>
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<div class="star-1 stars"></div>
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<div class="star-2 stars"></div>
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<div class="star-3 stars"></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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