Use pure css3 to realize the animation effect code of a circle spreading from the center to the surroundings

Let’s take a simple example first, for example:

@keyframes hovertreemove
{
from {top:30px;}
to {top:130px;}
}

Effect:
http://hovertree.com/texiao/css3/37/1 .htm

You can create animations through @keyframes rules.

The principle of creating animation is to gradually change one set of CSS styles into another set of styles.
You can change this set of CSS styles multiple times during the animation.
Specify the time when the change occurs as a percentage, or through the keywords "from" and "to", which are equivalent to 0% and 100%.
0% is the start time of the animation, 100% is the end time of the animation.
For best browser support, you should always define 0% and 100% selectors.

The following is the code for up and down movement:

nbsp;html><meta>
    <meta>
    <title>css3使用animation和@keyframes制作动画_何问起</title>
    <meta>
    <style>@keyframes hovertreemove{from {top:30px;}to {top:130px;}}
#hovertreekf{
    width:80px;height:80px;
    border:1px solid red;
    position:absolute;
    background:url(http://hovertree.com/themes/hvtimages/smile.png) no-repeat center;
    animation:hovertreemove /*动画样式名称*/
        1s /*动画时间*/
    linear /*线性运动*/
        infinite /*无限播放*/
        alternate/*往返动画*/;}
  a{color:blue;text-decoration:none;}  </style><a>说明</a>
    <p></p>

The following is the code for circular diffusion movement:

nbsp;html>
    <meta>
    <meta>
    <title>纯css3圆形从中心向四周扩散动画效果_何问起</title>
    <style>
        @keyframes warn {
            0% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.0;
            }

            25% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.1;
            }

            50% {
                transform: scale(0.5);
                -webkit-transform: scale(0.5);
                opacity: 0.3;
            }

            75% {
                transform: scale(0.8);
                -webkit-transform: scale(0.8);
                opacity: 0.5;
            }

            100% {
                transform: scale(1);
                -webkit-transform: scale(1);
                opacity: 0.0;
            }
        }

        @keyframes warn1 {
            0% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.0;
            }

            25% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.1;
            }

            50% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.3;
            }

            75% {
                transform: scale(0.5);
                -webkit-transform: scale(0.5);
                opacity: 0.5;
            }

            100% {
                transform: scale(0.8);
                -webkit-transform: scale(0.8);
                opacity: 0.0;
            }
        }

        .container {
            position: relative;
            width: 40px;
            height: 40px;
            /*border: 1px solid #000; hovertree.com */
        }
        /* 保持大小不变的小圆圈 何问起 */
        .dot {
            position: absolute;
            width: 92px;
            height: 92px;
            left: 120px;
            top: 120px;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border: 2px solid red;
            border-radius: 50%;
            z-index: 2;
        }
        /* 产生动画（向外扩散变大）的圆圈  */
        .pulse {
            position: absolute;
            width: 320px;
            height: 320px;
            left: 2px;
            top: 2px;
            border: 6px solid red;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border-radius: 50%;
            z-index: 1;
            opacity: 0;
            -webkit-animation: warn 2s ease-out;
            -moz-animation: warn 2s ease-out;
            animation: warn 2s ease-out;
            -webkit-animation-iteration-count: infinite;
            -moz-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
            box-shadow: 1px 1px 30px red;
        }

        .pulse1 {
            position: absolute;
            width: 320px;
            height: 320px;
            left: 2px;
            top: 2px;
            border: 6px solid red;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border-radius: 50%;
            z-index: 1;
            opacity: 0;
            -webkit-animation: warn1 2s ease-out;
            -moz-animation: warn1 2s ease-out;
            animation: warn1 2s ease-out;
            -webkit-animation-iteration-count: infinite;
            -moz-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
            box-shadow: 1px 1px 30px red;
        }a{color:blue;text-decoration:none;}
    </style><a>说明</a>
    <p>
        </p><p></p>
        <p></p>
        <p></p>
    

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