js dom setelah pemilih
//set an attribute and get it in js and set value
p:before {
content: attr(data-before);
color: red;
cursor: pointer;
}
$('p').on('click', function () {
$(this).attr('data-before','bar');
});
// or
//Add/remove a predetermined class
p:before {
content: "foo";
}
p.special:before {
content: "bar";
}
//or
var str = "bar";
document.styleSheets[0].addRule('p.special:before','content: "'+str+'";');
//read ::after,::before
var str = window.getComputedStyle(document.querySelector('p'), ':before')
.getPropertyValue('content');
Strange Snake