多个属性(比如background-image,background-repeat,background-size
属性 /title> styletype="text/css">div,span{background-color:#00
imgur.com/qalgrnj.jpeg'); //background-ima
这是 background-size 不同取值的规则,具体见 w3c
理解css3中的background-size(对响应性图片等比例缩放)
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