What custom rules are used for css3 animation?
css3 animation uses "@keyframes" to customize rules. "@keyframes" can specify animation rules and define the behavior of a period of CSS animation. The syntax is "@keyframes animation name {keyframes-selector {css-styles;}}".
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
@keyframes is a rule of CSS3 that can be used to define the behavior of a period of CSS animation and create simple animations.
@keyframes rules are composed of a set of encapsulated CSS style rules that describe how attribute values change over time.
@keyframes animation-name {keyframes-selector {css-styles;}}keyframes-selector: Defines the percentage of animation, it is between 0% and 100%. An animation can contain many selectors.
Then, using different CSS animation properties, you can control many different aspects of the animation, including the number of animation iterations, whether to alternate between the start and end values, and the animation Whether it should run or pause. Animations can also delay their start time.
@keyframe rules consist of the keyword "@keyframe", followed by an identifier giving the name of the animation (which will be referenced using animation-name), followed by a set of style rules (delimited by curly braces) . The animation is then applied to the element by using the identifier as the value of the animation-name attribute.
Syntax:
/* 定义动画*/
@keyframes 动画名称{
/* 样式规则*/
}
/* 将它应用于元素 */
.element {
animation-name: 动画名称（在@keyframes中已经声明好的）;
/* 或使用动画简写属性*/
animation: 动画名称 1s ...
}Inside the curly braces, we need to define keyframes or waypoints that specify the value of the property being animated at a specific point during the animation . This allows us to control intermediate steps in the animation sequence.
For example, a simple animated @keyframe can look like this:
@keyframes change-bg-color {
0% {
background-color: red;
}
50% {
background-color: blue;
}
100%{
background-color: red;
}
}
.demo{
-webkit-animation:change-bg-color 5s infinite;
animation: change-bg-color 5s infinite;
}
@keyframes change-bg-color {
from{
background-color: red;
}
50% {
background-color: blue;
}
to{
background-color: red;
}
}@keyframes bouncing {
0%, 50%, 100% { /* 或者 from, 50%, to */
top: 0;
}
25%, 75% {
top: 100px;
}
}css @keyframes Specify animation rule example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation: mymove 5s infinite;
-webkit-animation: mymove 5s infinite;
/* Safari and Chrome */
}
@keyframes mymove {
0% {
top: 0px;
left: 0px;
background: red;
}
25% {
top: 0px;
left: 100px;
background: blue;
}
50% {
top: 100px;
left: 100px;
background: yellow;
}
75% {
top: 100px;
left: 0px;
background: green;
}
100% {
top: 0px;
left: 0px;
background: red;
}
}
@-webkit-keyframes mymove
/* Safari and Chrome */
{
0% {
top: 0px;
left: 0px;
background: red;
}
25% {
top: 0px;
left: 100px;
background: blue;
}
50% {
top: 100px;
left: 100px;
background: yellow;
}
75% {
top: 100px;
left: 0px;
background: green;
}
100% {
top: 0px;
left: 0px;
background: red;
}
}
</style>
</head>
<body>
<div></div>
</body>
</html>
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