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console 命令行工具 X clear 

                    

                        
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console

            
<div class="imgBox" cover left>
</div>

            
div.imgBox {
    height: 300px;
    width: 300px;
    background: url(https://w.wallhaven.cc/full/9d/wallhaven-9dz1e8.jpg) no-repeat center center;
    background-size: 100% auto;
    background-color: #eee;
}

div.imgBox[top] {
    background-position: top;
}

div.imgBox[left] {
    background-position: left;
}

div.imgBox[cover] {
    background-size: cover;
}