91 lines
2.9 KiB
Markdown
91 lines
2.9 KiB
Markdown
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---
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id: bad82fee1322bd9aedf08721
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title: Understand Absolute versus Relative Units
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cN66JSL'
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---
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## Description
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<section id='description'>
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The last several challenges all set an element's margin or padding with pixels (<code>px</code>). Pixels are a type of length unit, which is what tells the browser how to size or space an item. In addition to <code>px</code>, CSS has a number of different length unit options that you can use.
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The two main types of length units are absolute and relative. Absolute units tie to physical units of length. For example, <code>in</code> and <code>mm</code> refer to inches and millimeters, respectively. Absolute length units approximate the actual measurement on a screen, but there are some differences depending on a screen's resolution.
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Relative units, such as <code>em</code> or <code>rem</code>, are relative to another length value. For example, <code>em</code> is based on the size of an element's font. If you use it to set the <code>font-size</code> property itself, it's relative to the parent's <code>font-size</code>.
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<strong>Note</strong><br>There are several relative unit options that are tied to the size of the viewport. They are covered in the Responsive Web Design Principles section.
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</section>
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## Instructions
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<section id='instructions'>
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Add a <code>padding</code> property to the element with class <code>red-box</code> and set it to <code>1.5em</code>.
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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: Your <code>red-box</code> class should have a <code>padding</code> property.
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testString: 'assert($(''.red-box'').css(''padding-top'') != ''0px'' && $(''.red-box'').css(''padding-right'') != ''0px'' && $(''.red-box'').css(''padding-bottom'') != ''0px'' && $(''.red-box'').css(''padding-left'') != ''0px'', ''Your <code>red-box</code> class should have a <code>padding</code> property.'');'
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- text: Your <code>red-box</code> class should give elements 1.5em of <code>padding</code>.
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testString: 'assert(code.match(/\.red-box\s*?{\s*?.*?\s*?.*?\s*?padding:\s*?1\.5em/gi), ''Your <code>red-box</code> class should give elements 1.5em of <code>padding</code>.'');'
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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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.injected-text {
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margin-bottom: -25px;
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text-align: center;
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}
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.box {
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border-style: solid;
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border-color: black;
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border-width: 5px;
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text-align: center;
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}
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.yellow-box {
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background-color: yellow;
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padding: 20px 40px 20px 40px;
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}
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.red-box {
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background-color: red;
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margin: 20px 40px 20px 40px;
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}
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.green-box {
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background-color: green;
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margin: 20px 40px 20px 40px;
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}
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</style>
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<h5 class="injected-text">margin</h5>
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<div class="box yellow-box">
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<h5 class="box red-box">padding</h5>
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<h5 class="box green-box">padding</h5>
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</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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