SOURCE

console 命令行工具 X clear

                    
>
console
<div class="a b"> 2</div>

<p name="123">2333</p>
.a{
    width: 100px;
    height: 100px;
    background-color: red
}

.b{
    width: 100px;
    height: 100px;
    background-color: blue
}


.a.b{
   width: 100px;
    height: 100px;
    background-color: yellow
}

/* 它会先去找.a的然后找.b的然后找.a.b的 */
[name]{
    color: red
}