* fix: css and html issues * fix: issues with css test * fix: allow spaces in solution css * fix: css tests for use-rgb-to-mix-colors
124 lines
3.0 KiB
Markdown
124 lines
3.0 KiB
Markdown
---
|
|
id: bad82fee1322bd9aedf08721
|
|
title: Understand Absolute versus Relative Units
|
|
challengeType: 0
|
|
videoUrl: 'https://scrimba.com/c/cN66JSL'
|
|
forumTopicId: 301089
|
|
dashedName: understand-absolute-versus-relative-units
|
|
---
|
|
|
|
# --description--
|
|
|
|
The last several challenges all set an element's margin or padding with pixels (`px`). Pixels are a type of length unit, which is what tells the browser how to size or space an item. In addition to `px`, CSS has a number of different length unit options that you can use.
|
|
|
|
The two main types of length units are absolute and relative. Absolute units tie to physical units of length. For example, `in` and `mm` 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.
|
|
|
|
Relative units, such as `em` or `rem`, are relative to another length value. For example, `em` is based on the size of an element's font. If you use it to set the `font-size` property itself, it's relative to the parent's `font-size`.
|
|
|
|
**Note:** 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.
|
|
|
|
# --instructions--
|
|
|
|
Add a `padding` property to the element with class `red-box` and set it to `1.5em`.
|
|
|
|
# --hints--
|
|
|
|
Your `red-box` class should have a `padding` property.
|
|
|
|
```js
|
|
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 `red-box` class should give elements 1.5em of `padding`.
|
|
|
|
```js
|
|
assert(code.match(/\.red-box\s*?{[\s\S]*padding\s*:\s*?1\.5em/gi));
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<style>
|
|
.injected-text {
|
|
margin-bottom: -25px;
|
|
text-align: center;
|
|
}
|
|
|
|
.box {
|
|
border-style: solid;
|
|
border-color: black;
|
|
border-width: 5px;
|
|
text-align: center;
|
|
}
|
|
|
|
.yellow-box {
|
|
background-color: yellow;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.red-box {
|
|
background-color: red;
|
|
margin: 20px 40px 20px 40px;
|
|
|
|
}
|
|
|
|
.green-box {
|
|
background-color: green;
|
|
margin: 20px 40px 20px 40px;
|
|
}
|
|
</style>
|
|
<h5 class="injected-text">margin</h5>
|
|
|
|
<div class="box yellow-box">
|
|
<h5 class="box red-box">padding</h5>
|
|
<h5 class="box green-box">padding</h5>
|
|
</div>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```html
|
|
<style>
|
|
.injected-text {
|
|
margin-bottom: -25px;
|
|
text-align: center;
|
|
}
|
|
|
|
.box {
|
|
border-style: solid;
|
|
border-color: black;
|
|
border-width: 5px;
|
|
text-align: center;
|
|
}
|
|
|
|
.yellow-box {
|
|
background-color: yellow;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.red-box {
|
|
background-color: red;
|
|
margin: 20px 40px 20px 40px;
|
|
padding: 1.5em;
|
|
}
|
|
|
|
.green-box {
|
|
background-color: green;
|
|
margin: 20px 40px 20px 40px;
|
|
}
|
|
</style>
|
|
<h5 class="injected-text">margin</h5>
|
|
|
|
<div class="box yellow-box">
|
|
<h5 class="box red-box">padding</h5>
|
|
<h5 class="box green-box">padding</h5>
|
|
</div>
|
|
```
|