var list = document.body.getElementsByClassName("highlight");
for(i=0; i <= list.length-1; i++){
var code = list[i].firstElementChild.firstElementChild
var codeName =  code ? code.className.split(":")[1] : null;

if(codeName) {
var div = document.createElement('div');
div.textContent = codeName;
div.classList.add('code-name');
code.parentNode.insertBefore(div, code);
} 
};