div{background-size: 50% auto}
div.a{background: url(../images/a.png) no-repeat left top}
div.b{background: url(../images/b.png) no-repeat left top}
you want this background-size to be written only once, and the following one is abbreviated. How do you write it?
you"d better not! important
div { background: transparent no-repeat left top; background-size: 50% auto; }
div.a { background-image: url(../images/a.png); }
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