css3 - Hard time to understand :after selector CSS -

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according http://www.w3schools.com/cssref/sel_after.asp, after selector includes after each element. understand perfectly. found css-only slider in internet, one: link part of code

.slider label:after {     border-radius: 100%;     bottom: -.2em;     box-shadow: inset 0 0 0 .2em #111,                 inset 0 2px 2px #000,                 0 1px 1px hsla(0,0%,100%,.25);     content: '';     left: -.2em;     position: absolute;     right: -.2em;     top: -.2em; }

makes selected picture color radios-circle in white. shouldn't inserted after each label inside .slider ? why aplies selected 1 ?

ofcourse understanding right. specific slider, has below css rules.

.slider input:checked + label {   background-color: #fff; }

the above code works like: if input checked, add background color sibling(+) element label


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