Pseudo-content
Read the content of a pseudo-element.
Install
bower install pseudo-content
Use
@media (max-width: 414px) {
#foo:before {
content: 'mobile';
}
}
var foo = document.getElementById('foo'),
fooPseudoContent = pseudoContent(foo, 'before');
console.log(fooPseudoContent.get()); // mobile
console.log(fooPseudoContent.is('mobile')); // true