andre/30-seconds-of-code
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'master' into copyToClipboard

Browse Source
This commit is contained in:
Stefan Feješ
2018-03-06 08:59:32 +01:00
committed by GitHub
parent d0d9afa598 edea576023
commit 96ce56cf17
58 changed files with 1742 additions and 458 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
snippets/bouncing-loader.md Normal file
View File

@ -0,0 +1,113 @@
### Bouncing loader
Creates a bouncing loader animation.
#### HTML
```html
<div class="bouncing-loader">
<div></div>
<div></div>
<div></div>
</div>
```
#### CSS
```css
@keyframes bouncing-loader {
from {
opacity: 1;
transform: translateY(0);
}
to {
opacity: 0.1;
transform: translateY(-1rem);
}
}
.bouncing-loader {
display: flex;
justify-content: center;
}
.bouncing-loader > div {
width: 1rem;
height: 1rem;
margin: 3rem 0.2rem;
background: #8385aa;
border-radius: 50%;
animation: bouncing-loader 0.6s infinite alternate;
}
.bouncing-loader > div:nth-of-type(2) {
animation-delay: 0.2s;
}
.bouncing-loader > div:nth-of-type(3) {
animation-delay: 0.4s;
}
```
#### Demo
<div class="snippet-demo">
<div class="snippet-demo__bouncing-loader">
<div></div>
<div></div>
<div></div>
</div>
</div>
<style>
@keyframes bouncing-loader {
from {
opacity: 1;
transform: translateY(0);
}
to {
opacity: 0.1;
transform: translateY(-1rem);
}
}
.snippet-demo__bouncing-loader {
display: flex;
justify-content: center;
}
.snippet-demo__bouncing-loader > div {
width: 1rem;
height: 1rem;
margin: 3rem 0.2rem;
background: #8385aa;
border-radius: 50%;
animation: bouncing-loader 0.6s infinite alternate;
}
.snippet-demo__bouncing-loader > div:nth-child(2) {
animation-delay: 0.2s;
}
.snippet-demo__bouncing-loader > div:nth-child(3) {
animation-delay: 0.4s;
}
</style>
#### Explanation
Note: `1rem` is usually `16px`.
1. `@keyframes` defines an animation that has two states, where the element changes `opacity`, and is translated up on the 2D plane using `transform: translateY()`.
2. `.bouncing-loader` is the parent container of the bouncing circles and uses `display: flex`
and `justify-content: center` to position them in the in the center.
3. Using `.bouncing-loader > div`, we target the three child `div`s of the parent to be styled. The `div`s are given a width and height of `1rem`, using `border-radius: 50%` to turn them from squares to circles.
4. `margin: 3rem 0.2rem` specifies that each circle has a top/bottom margin of `3rem` and left/right margin
of `0.2rem` so that they do not directly touch each other, giving them some breathing room.
5. `animation` is a shorthand property for the various animation properties: `animation-name`, `animation-duration`, `animation-iteration-count`, `animation-direction` are used.
6. `animation-delay` is used on the second and third `div` respectively, so that each element does not start the animation at the same time.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-animation
<!-- tags: animation -->

2
snippets/box-sizing-reset.md
View File

@ -44,3 +44,5 @@ html {
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css3-boxsizing
<!-- tags: layout -->

50
snippets/circle.md Normal file
View File

@ -0,0 +1,50 @@
### Circle
Creates a circle shape with pure CSS.
#### HTML
```html
<div class="circle"></div>
```
#### CSS
```css
.circle {
border-radius: 50%;
width: 2rem;
height: 2rem;
background: #333;
}
```
#### Demo
<div class="snippet-demo">
<div class="snippet-demo__circle"></div>
</div>
<style>
.snippet-demo__circle {
border-radius: 50%;
width: 2rem;
height: 2rem;
background: #333;
}
</style>
#### Explanation
`border-radius: 50%` curves the borders of an element to create a circle.
Since a circle has the same radius at any given point, the `width` and `height` must be the same. Differing
values will create an ellipse.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=border-radius
<!-- tags: visual -->

6
snippets/clearfix.md
View File

@ -18,7 +18,7 @@ Ensures that an element self-clears its children.
```css
.clearfix::after {
content: "";
content: '';
display: block;
clear: both;
}
@ -59,4 +59,6 @@ Ensures that an element self-clears its children.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<span class="snippet__support-note">⚠️ For this snippet to work properly you need to ensure that there are no non-floating children in the container and that there are no tall floats before the clearfixed container but in the same formatting context (e.g. floated columns).</span>
<!-- tags: layout -->

2
snippets/constant-width-to-height-ratio.md
View File

@ -43,3 +43,5 @@ causes an element's height to become a percentage of its parent's width, i.e. `5
#### Browser support
<span class="snippet__support-note">⚠️ `padding-top` pushes any content within the element to the bottom.</span>
<!-- tags: layout -->

6
snippets/custom-scrollbar.md
View File

@ -19,13 +19,13 @@ Customizes the scrollbar style for the document and elements with scrollable ove
}
::-webkit-scrollbar-track {
box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
border-radius: 10px;
}
::-webkit-scrollbar-thumb {
border-radius: 10px;
box-shadow: inset 0 0 6px rgba(0,0,0,0.5);
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
}
/* Scrollable element */
@ -80,3 +80,5 @@ There are many other pseudo-elements that you can use to style scrollbars. For m
<span class="snippet__support-note">⚠️ Scrollbar styling doesn't appear to be on any standards track.</span>
* https://caniuse.com/#feat=css-scrollbar
<!-- tags: visual -->

2
snippets/custom-text-selection.md
View File

@ -48,3 +48,5 @@ Changes the styling of text selection.
in any specification.</span>
* https://caniuse.com/#feat=css-selection
<!-- tags: visual -->

3
snippets/disable-selection.md
View File

@ -37,5 +37,8 @@ Makes the content unselectable.
#### Browser support
<span class="snippet__support-note">⚠️ Requires prefixes for full support.</span>
<span class="snippet__support-note">⚠️ This is not a secure method to prevent users from copying content.</span>
* https://caniuse.com/#feat=user-select-none
<!-- tags: interactivity -->

10
snippets/donut-spinner.md
View File

@ -12,8 +12,12 @@ Creates a donut spinner that can be used to indicate the loading of content.
```css
@keyframes donut-spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
.donut {
display: inline-block;
@ -59,3 +63,5 @@ serve as the loading indicator for the donut. Use `animation` to rotate the elem
* https://caniuse.com/#feat=css-animation
* https://caniuse.com/#feat=transforms2d
<!-- tags: animation -->

2
snippets/easing-variables.md
View File

@ -104,3 +104,5 @@ The variables are defined globally within the `:root` CSS pseudo-class which mat
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-variables
<!-- tags: animation -->

2
snippets/etched-text.md
View File

@ -49,3 +49,5 @@ of the background.
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-textshadow
<!-- tags: visual -->

2
snippets/evenly-distributed-children.md
View File

@ -51,3 +51,5 @@ Alternatively, use `justify-content: space-around` to distribute the children wi
<span class="snippet__support-note">⚠️ Needs prefixes for full support.</span>
* https://caniuse.com/#feat=flexbox
<!-- tags: layout -->

18
snippets/horizontal-and-vertical-centering.md → snippets/flexbox-centering.md
View File

@ -1,19 +1,19 @@
### Horizontal and vertical centering
### Flexbox centering
Horizontally and vertically centers a child element within a parent element.
Horizontally and vertically centers a child element within a parent element using `flexbox`.
#### HTML
```html
<div class="horizontal-and-vertical-centering">
<div class="child"></div>
<div class="flexbox-centering">
<div class="child">Centered content.</div>
</div>
```
#### CSS
```css
.horizontal-and-vertical-centering {
.flexbox-centering {
display: flex;
justify-content: center;
align-items: center;
@ -23,13 +23,13 @@ Horizontally and vertically centers a child element within a parent element.
#### Demo
<div class="snippet-demo">
<div class="snippet-demo__horizontal-and-vertical-centering">
<p class="snippet-demo__horizontal-and-vertical-centering__child">Centered content.</p>
<div class="snippet-demo__flexbox-centering">
<p class="snippet-demo__flexbox-centering__child">Centered content.</p>
</div>
</div>
<style>
.snippet-demo__horizontal-and-vertical-centering {
.snippet-demo__flexbox-centering {
display: flex;
justify-content: center;
align-items: center;
@ -48,3 +48,5 @@ Horizontally and vertically centers a child element within a parent element.
<span class="snippet__support-note">⚠️ Needs prefixes for full support.</span>
* https://caniuse.com/#feat=flexbox
<!-- tags: layout -->

2
snippets/gradient-text.md
View File

@ -49,3 +49,5 @@ Gives text a gradient color.
<span class="snippet__support-note">⚠️ Uses non-standard properties.</span>
* https://caniuse.com/#feat=text-stroke
<!-- tags: visual -->

52
snippets/grid-centering.md Normal file
View File

@ -0,0 +1,52 @@
### Grid centering
Horizontally and vertically centers a child element within a parent element using `grid`.
#### HTML
```html
<div class="grid-centering">
<div class="child">Centered content.</div>
</div>
```
#### CSS
```css
.grid-centering {
display: grid;
justify-content: center;
align-items: center;
}
```
#### Demo
<div class="snippet-demo">
<div class="snippet-demo__grid-centering">
<p class="snippet-demo__grid-centering__child">Centered content.</p>
</div>
</div>
<style>
.snippet-demo__grid-centering {
display: grid;
justify-content: center;
align-items: center;
height: 200px;
}
</style>
#### Explanation
1. `display: grid` enables grid.
2. `justify-content: center` centers the child horizontally.
3. `align-items: center` centers the child vertically.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-grid
<!-- tags: layout -->

2
snippets/hairline-border.md
View File

@ -81,3 +81,5 @@ very sharp and crisp.
<hr>
\*Chrome does not support subpixel values on `border`. Safari does not support subpixel values on `box-shadow`. Firefox supports subpixel values on both.
<!-- tags: visual -->

10
snippets/hover-underline-animation.md
View File

@ -69,7 +69,7 @@ Creates an animated underline effect when the text is hovered over.
#### Explanation
1. `display: inline-block` makes the block `p` an `inline-block` to prevent the underline from
spanning the entire parent width rather than just the content (text).
spanning the entire parent width rather than just the content (text).
2. `position: relative` on the element establishes a Cartesian positioning context for pseudo-elements.
3. `::after` defines a pseudo-element.
4. `position: absolute` takes the pseudo element out of the flow of the document and positions it in relation to the parent.
@ -77,11 +77,11 @@ spanning the entire parent width rather than just the content (text).
6. `transform: scaleX(0)` initially scales the pseudo element to 0 so it has no width and is not visible.
7. `bottom: 0` and `left: 0` position it to the bottom left of the block.
8. `transition: transform 0.25s ease-out` means changes to `transform` will be transitioned over 0.25 seconds
with an `ease-out` timing function.
with an `ease-out` timing function.
9. `transform-origin: bottom right` means the transform anchor point is positioned at the bottom right of the block.
10. `:hover::after` then uses `scaleX(1)` to transition the width to 100%, then changes the `transform-origin`
to `bottom left` so that the anchor point is reversed, allowing it transition out in the other direction when
hovered off.
to `bottom left` so that the anchor point is reversed, allowing it transition out in the other direction when
hovered off.
#### Browser support
@ -89,3 +89,5 @@ hovered off.
* https://caniuse.com/#feat=transforms2d
* https://caniuse.com/#feat=css-transitions
<!-- tags: animation -->

7
snippets/mouse-cursor-gradient-tracking.md
View File

@ -41,7 +41,7 @@ A hover effect where the gradient follows the mouse cursor.
height: var(--size);
background: radial-gradient(circle closest-side, pink, transparent);
transform: translate(-50%, -50%);
transition: width .2s ease, height .2s ease;
transition: width 0.2s ease, height 0.2s ease;
}
.mouse-cursor-gradient-tracking:hover::before {
@ -53,7 +53,7 @@ A hover effect where the gradient follows the mouse cursor.
```js
var btn = document.querySelector('.mouse-cursor-gradient-tracking')
btn.onmousemove = function (e) {
btn.onmousemove = function(e) {
var x = e.pageX - btn.offsetLeft
var y = e.pageY - btn.offsetTop
btn.style.setProperty('--x', x + 'px')
@ -131,7 +131,10 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
```
#### Browser support
<div class="snippet__requires-javascript">Requires JavaScript</div>
<span class="snippet__support-note">⚠️ Requires JavaScript.</span>
* https://caniuse.com/#feat=css-variables
<!-- tags: visual, interactivity -->

27
snippets/overflow-scroll-gradient.md
View File

@ -22,16 +22,19 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
content: '';
position: absolute;
bottom: 0;
width: 300px;
width: 240px;
height: 25px;
background: linear-gradient(rgba(255, 255, 255, 0.001), white); /* transparent keyword is broken in Safari */
background: linear-gradient(
rgba(255, 255, 255, 0.001),
white
); /* transparent keyword is broken in Safari */
pointer-events: none;
}
.overflow-scroll-gradient__scroller {
overflow-y: scroll;
background: white;
width: 300px;
height: 250px;
width: 240px;
height: 200px;
padding: 15px 0;
line-height: 1.2;
text-align: center;
@ -56,7 +59,7 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
content: '';
background: linear-gradient(rgba(255, 255, 255, 0.001), white);
position: absolute;
width: 300px;
width: 240px;
height: 25px;
bottom: 0;
pointer-events: none;
@ -64,8 +67,8 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
.snippet-demo__overflow-scroll-gradient__scroller {
overflow-y: scroll;
background: white;
width: 300px;
height: 250px;
width: 240px;
height: 200px;
padding: 15px 0;
line-height: 1.2;
text-align: center;
@ -73,7 +76,7 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
</style>
<script>
document.querySelector('.snippet-demo__overflow-scroll-gradient__scroller').innerHTML = 'content '.repeat(200)
document.querySelector('.snippet-demo__overflow-scroll-gradient__scroller').innerHTML = 'content '.repeat(100)
</script>
#### Explanation
@ -81,10 +84,10 @@ document.querySelector('.snippet-demo__overflow-scroll-gradient__scroller').inne
1. `position: relative` on the parent establishes a Cartesian positioning context for pseudo-elements.
2. `::after` defines a pseudo element.
3. `background-image: linear-gradient(...)` adds a linear gradient that fades from transparent to white
(top to bottom).
(top to bottom).
4. `position: absolute` takes the pseudo element out of the flow of the document and positions it in relation to the parent.
5. `width: 300px` matches the size of the scrolling element (which is a child of the parent that has
the pseudo element).
5. `width: 240px` matches the size of the scrolling element (which is a child of the parent that has
the pseudo element).
6. `height: 25px` is the height of the fading gradient pseudo-element, which should be kept relatively small.
7. `bottom: 0` positions the pseudo-element at the bottom of the parent.
8. `pointer-events: none` specifies that the pseudo-element cannot be a target of mouse events, allowing text behind it to still be selectable/interactive.
@ -94,3 +97,5 @@ document.querySelector('.snippet-demo__overflow-scroll-gradient__scroller').inne
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-gradients
<!-- tags: visual -->

2
snippets/popout-menu.md
View File

@ -75,3 +75,5 @@ Reveals an interactive popout menu on hover.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<!-- tags: interactivity -->

15
snippets/pretty-text-underline.md
View File

@ -16,10 +16,7 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
font-family: Arial, sans-serif;
display: inline;
font-size: 18px;
text-shadow: 1px 1px 0 #f5f6f9,
-1px 1px 0 #f5f6f9,
-1px -1px 0 #f5f6f9,
1px -1px 0 #f5f6f9;
text-shadow: 1px 1px 0 #f5f6f9, -1px 1px 0 #f5f6f9, -1px -1px 0 #f5f6f9, 1px -1px 0 #f5f6f9;
background-image: linear-gradient(90deg, currentColor 100%, transparent 100%);
background-position: 0 0.98em;
background-repeat: repeat-x;
@ -70,13 +67,13 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
#### Explanation
1. `text-shadow: ...` has 4 values with offsets that cover a 4x4 px area to ensure the underline
has a "thick" shadow that covers the line where descenders clip it. Use a color
that matches the background. For a larger font, use a larger `px` size.
has a "thick" shadow that covers the line where descenders clip it. Use a color
that matches the background. For a larger font, use a larger `px` size.
2. `background-image: linear-gradient(...)` creates a 90deg gradient with the current
text color (`currentColor`).
text color (`currentColor`).
3. The `background-*` properties size the gradient as 1x1px at the bottom and repeats it along the x-axis.
4. The `::selection` pseudo selector ensures the text shadow does not interfere with text
selection.
selection.
#### Browser support
@ -84,3 +81,5 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
* https://caniuse.com/#feat=css-textshadow
* https://caniuse.com/#feat=css-gradients
<!-- tags: visual -->

47
snippets/reset-all-styles.md Normal file
View File

@ -0,0 +1,47 @@
### Reset all styles
Resets all styles to default values with one property. This will not affect `direction` and `unicode-bidi` properties.
#### HTML
```html
<div class="reset-all-styles">
<h4>Title</h4>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Iure id exercitationem nulla qui repellat laborum vitae, molestias tempora velit natus. Quas, assumenda nisi. Quisquam enim qui iure, consequatur velit sit?</p>
</div>
```
#### CSS
```css
.reset-all-styles {
all: initial;
}
```
#### Demo
<div class="snippet-demo">
<div class="snippet-demo__reset-all-styles">
<h3>Title</h3>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Iure id exercitationem nulla qui repellat laborum vitae, molestias tempora velit natus. Quas, assumenda nisi. Quisquam enim qui iure, consequatur velit sit?</p>
</div>
</div>
<style>
.snippet-demo__reset-all-styles {
all: initial;
}
</style>
#### Explanation
The `all` property allows you to reset all styles (inherited or not) to default values.
#### Browser support
<span class="snippet__support-note">⚠️ MS Edge status is under consideration.</span>
* https://caniuse.com/#feat=css-all
<!-- tags: visual -->

3
snippets/shape-separator.md
View File

@ -14,6 +14,7 @@ Uses an SVG shape to separate two different blocks to create more a interesting
.shape-separator {
position: relative;
height: 48px;
background: #333;
}
.shape-separator::after {
content: '';
@ -64,3 +65,5 @@ Uses an SVG shape to separate two different blocks to create more a interesting
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=svg
<!-- tags: visual -->

74
snippets/sibling-fade.md Normal file
View File

@ -0,0 +1,74 @@
### Sibling fade
Fades out the siblings of a hovered item.
#### HTML
```html
<div class="sibling-fade">
<span>Item 1</span>
<span>Item 2</span>
<span>Item 3</span>
<span>Item 4</span>
<span>Item 5</span>
<span>Item 6</span>
</div>
```
#### CSS
```css
span {
padding: 0 1rem;
transition: opacity 0.2s;
}
.sibling-fade:hover span:not(:hover) {
opacity: 0.5;
}
```
#### Demo
<div class="snippet-demo">
<nav class="snippet-demo__sibling-fade">
<span>Item 1</span>
<span>Item 2</span>
<span>Item 3</span>
<span>Item 4</span>
<span>Item 5</span>
<span>Item 6</span>
</nav>
</div>
<style>
.snippet-demo__sibling-fade {
cursor: default;
line-height: 2;
vertical-align: middle;
}
.snippet-demo__sibling-fade span {
padding: 1rem;
transition: opacity 0.2s;
}
.snippet-demo__sibling-fade:hover span:not(:hover) {
opacity: 0.5;
}
</style>
#### Explanation
1. `transition: opacity 0.2s` specifies that changes to opacity will be transitioned over 0.2 seconds.
2. `.sibling-fade:hover span:not(:hover)` specifies that when the parent is hovered, select any `span` children
that are not currently being hovered and change their opacity to `0.5`.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
* https://caniuse.com/#feat=css-sel3
* https://caniuse.com/#feat=css-transitions
<!-- tags: interactivity -->

5
snippets/system-font-stack.md
View File

@ -12,7 +12,8 @@ Uses the native font of the operating system to get close to a native app feel.
```css
.system-font-stack {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial, sans-serif;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu,
Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif;
}
```
@ -46,3 +47,5 @@ falls back to the next if it cannot find the font (on the system or defined in C
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<!-- tags: visual -->

2
snippets/triangle.md
View File

@ -89,3 +89,5 @@ Experiment with the `px` values to change the proportion of the triangle.
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<!-- tags: visual -->

2
snippets/truncate-text.md
View File

@ -51,3 +51,5 @@ If the text is longer than one line, it will be truncated and end with an ellips
<span class="snippet__support-note">⚠️ Only works for single line elements.</span>
* https://caniuse.com/#feat=text-overflow
<!-- tags: layout -->