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C # tutorial
CSS allows animation of HTML elements without using JavaScript or Flash!
CSS allows animation of HTML elements without using JavaScript or Flash!
CSS
In this chapter you will learn about the following properties:
@keyframesanimation-nameanimation-durationanimation-delayanimation-iteration-countanimation-directionanimation-timing-functionanimation-fill-modeanimationThe numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| @keyframes | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-name | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-duration | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-delay | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-iteration-count | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-direction | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-timing-function | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation-fill-mode | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
| animation | 43.0 | 10.0 | 16.0 | 9.0 | 30.0 |
An animation lets an element gradually change from one style to another.
You can change as many CSS properties you want, as many times as you want.
To use CSS animation, you must first specify some keyframes for the animation.
Keyframes hold what styles the element will have at certain times.
When you specify CSS styles inside the @keyframes
rule, the animation will gradually change from the current style to the new style
at certain times.
To get an animation to work, you must bind the animation to an element.
The following example binds the "example" animation to the <div> element. The animation will last for 4 seconds, and it will gradually change the background-color of the <div> element from "red" to "yellow":
/* The animation code */
@keyframes example {
from {background-color: red;}
to {background-color: yellow;}
}
/* The element to apply the animation to */
div {
width: 100px;
height: 100px;
background-color: red;
animation-name: example;
animation-duration: 4s;
}
animation-duration property
defines how long an animation should take to complete. If the animation-duration property is not specified,
no animation will occur, because
the default value is 0s (0 seconds).
In the example above we have specified when the style will change by using the keywords "from" and "to" (which represents 0% (start) and 100% (complete)).
It is also possible to use percent. By using percent, you can add as many style changes as you like.
The following example will change the background-color of the <div> element when the animation is 25% complete, 50% complete, and again when the animation is 100% complete:
/* The animation code */
@keyframes example
{
0% {background-color: red;}
25% {background-color: yellow;}
50% {background-color: blue;}
100% {background-color: green;}
}
/* The element to apply the animation to */
div {
width: 100px;
height: 100px;
background-color: red;
animation-name: example;
animation-duration: 4s;
}
The following example will change both the background-color and the position of the <div> element when the animation is 25% complete, 50% complete, and again when the animation is 100% complete:
/* The animation code */
@keyframes example
{
0% {background-color:red; left:0px; top:0px;}
25% {background-color:yellow; left:200px; top:0px;}
50% {background-color:blue; left:200px; top:200px;}
75% {background-color:green; left:0px; top:200px;}
100% {background-color:red; left:0px; top:0px;}
}
/* The element to apply the animation to */
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
}
The animation-delay property specifies a delay for the start of an animation.
The following example has a 2 seconds delay before starting the animation:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-delay: 2s;
}
Negative values are also allowed. If using negative values, the animation will start as if it had already been playing for N seconds.
In the following example, the animation will start as if it had already been playing for 2 seconds:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-delay: -2s;
}
The animation-iteration-count property specifies the number of times an animation should run.
The following example will run the animation 3 times before it stops:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-iteration-count: 3;
}
The following example uses the value "infinite" to make the animation continue for ever:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-iteration-count:
infinite;
}
The animation-direction property specifies
whether an animation should be played forwards, backwards or in alternate
cycles.
The animation-direction property can have the following values:
normal - The animation is played as normal
(forwards). This is defaultreverse - The animation is played in
reverse direction (backwards)alternate - The animation is played
forwards first, then backwardsalternate-reverse - The animation is played
backwards first, then forwardsThe following example will run the animation in reverse direction (backwards):
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-direction:
reverse;
}
The following example uses the value "alternate" to make the animation run forwards first, then backwards:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-iteration-count: 2;
animation-direction:
alternate;
}
The following example uses the value "alternate-reverse" to make the animation run backwards first, then forwards:
div {
width: 100px;
height: 100px;
position: relative;
background-color: red;
animation-name: example;
animation-duration: 4s;
animation-iteration-count: 2;
animation-direction:
alternate-reverse;
}
The animation-timing-function property specifies the speed curve of the
animation.
The animation-timing-function property can have the following values:
ease - Specifies an animation with a slow start, then fast, then end slowly (this is default)linear - Specifies an animation with the same speed from start to endease-in - Specifies an animation with a slow startease-out - Specifies an animation with a slow endease-in-out - Specifies an animation with a slow start and endcubic-bezier(n,n,n,n) - Lets you define your own values in a cubic-bezier functionThe following example shows some of the different speed curves that can be used:
#div1 {animation-timing-function: linear;}
#div2
{animation-timing-function: ease;}
#div3 {animation-timing-function:
ease-in;}
#div4 {animation-timing-function: ease-out;}
#div5
{animation-timing-function: ease-in-out;}
CSS animations do not affect an element before the first keyframe is played or after the last keyframe is played. The animation-fill-mode property can override this behavior.
The animation-fill-mode property specifies a
style for the target element when the animation is not playing (before it
starts, after it ends, or both).
The animation-fill-mode property can have the following values:
none - Default value. Animation will not
apply any styles to the element before or after it is executingforwards - The element will retain the
style values that is set by the last keyframe (depends on animation-direction
and animation-iteration-count)backwards - The element will get the style
values that is set by the first keyframe (depends on animation-direction), and
retain this during the animation-delay periodboth - The animation will follow the rules
for both forwards and backwards, extending the animation properties in both
directionsThe following example lets the <div> element retain the style values from the last keyframe when the animation ends:
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation-name: example;
animation-duration: 3s;
animation-fill-mode: forwards;
}
The following example lets the <div> element get the style values set by the first keyframe before the animation starts (during the animation-delay period):
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation-name: example;
animation-duration: 3s;
animation-delay: 2s;
animation-fill-mode: backwards;
}
The following example lets the <div> element get the style values set by the first keyframe before the animation starts, and retain the style values from the last keyframe when the animation ends:
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation-name: example;
animation-duration: 3s;
animation-delay: 2s;
animation-fill-mode: both;
}
The example below uses six of the animation properties:
div
{
animation-name: example;
animation-duration: 5s;
animation-timing-function: linear;
animation-delay: 2s;
animation-iteration-count: infinite;
animation-direction: alternate;
}
The same animation effect as above can be achieved by using the shorthand
animation property:
div
{
animation: example 5s linear 2s infinite alternate;
}
Add a 2 second animation for the <div> element, which changes the color from red to blue. Call the animation "example".
<style>
div {
width: 100px;
height: 100px;
background-color: red;
animation-name: ;
: 2s;
}
@keyframes example {
from {: red;}
to {: blue;}
}
</style>
<body>
<div>This is a div</div>
</body>
The following table lists the @keyframes rule and all the CSS animation properties:
| Property | Description |
|---|---|
| @keyframes | Specifies the animation code |
| animation | A shorthand property for setting all the animation properties |
| animation-delay | Specifies a delay for the start of an animation |
| animation-direction | Specifies whether an animation should be played forwards, backwards or in alternate cycles |
| animation-duration | Specifies how long time an animation should take to complete one cycle |
| animation-fill-mode | Specifies a style for the element when the animation is not playing (before it starts, after it ends, or both) |
| animation-iteration-count | Specifies the number of times an animation should be played |
| animation-name | Specifies the name of the @keyframes animation |
| animation-play-state | Specifies whether the animation is running or paused |
| animation-timing-function | Specifies the speed curve of the animation |