79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
94 lines
3.4 KiB
Markdown
94 lines
3.4 KiB
Markdown
---
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id: 587d78a7367417b2b2512ae1
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title: Create Movement Using CSS Animation
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/c7amZfW'
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---
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## Description
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<section id='description'>
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When elements have a specified <code>position</code>, such as <code>fixed</code> or <code>relative</code>, the CSS offset properties <code>right</code>, <code>left</code>, <code>top</code>, and <code>bottom</code> can be used in animation rules to create movement.
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As shown in the example below, you can push the item downwards then upwards by setting the <code>top</code> property of the <code>50%</code> keyframe to 50px, but having it set to 0px for the first (<code>0%</code>) and the last (<code>100%</code>) keyframe.
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<blockquote>@keyframes rainbow {<br> 0% {<br> background-color: blue;<br> top: 0px;<br> }<br> 50% {<br> background-color: green;<br> top: 50px;<br> }<br> 100% {<br> background-color: yellow;<br> top: 0px;<br> }<br>}</blockquote>
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</section>
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## Instructions
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<section id='instructions'>
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Add a horizontal motion to the <code>div</code> animation. Using the <code>left</code> offset property, add to the <code>@keyframes</code> rule so rainbow starts at 0 pixels at <code>0%</code>, moves to 25 pixels at <code>50%</code>, and ends at -25 pixels at <code>100%</code>. Don't replace the <code>top</code> property in the editor - the animation should have both vertical and horizontal motion.
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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>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.
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testString: assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?top:\s*?0(px)?;\s*?left:\s*?0(px)?;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.');
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- text: The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.
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testString: assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?top:\s*?50px;\s*?left:\s*?25px;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.');
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- text: The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.
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testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?top:\s*?0(px)?;\s*?left:\s*?-25px;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.');
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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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div {
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height: 40px;
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width: 70%;
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background: black;
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margin: 50px auto;
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border-radius: 5px;
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position: relative;
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}
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#rect {
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animation-name: rainbow;
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animation-duration: 4s;
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}
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@keyframes rainbow {
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0% {
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background-color: blue;
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top: 0px;
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}
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50% {
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background-color: green;
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top: 50px;
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}
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100% {
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background-color: yellow;
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top: 0px;
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}
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}
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</style>
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<div id="rect"></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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var code = "@keyframes rainbow {0% {background-color: blue; top: 0px; left: 0px;} 50% {background-color: green; top: 50px; left: 25px;} 100% {background-color: yellow; top: 0px; left:-25px;}}"
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```
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</section>
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