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<div class="demo"></div>
<div class="task"></div>
输入 JavaScript 代码……
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.demo{
width: 300px;
height: 140px;
border: 1px solid #999;
background-image: url(https://static.runcodex.com/images/mix/54cf2365000140e600740095.jpg),
url(https://static.runcodex.com/images/mix/54cf238a0001728d00740095.jpg),
url(https://static.runcodex.com/images/mix/54cf23b60001fd9700740096.jpg);
background-position: left top, 100px 0, 200px 0;
background-repeat: no-repeat, no-repeat, no-repeat;
margin:0 0 20px 0;
}
.task {
background:url(https://static.runcodex.com/images/runcodex-logo.png) no-repeat,
url(https://static.runcodex.com/images/runcodex-logo.png) no-repeat;