in resources/web/lib/prettify/prettify.js [699:710]
function childContentWrapper(element) {
var wrapper = undefined;
for (var c = element.firstChild; c; c = c.nextSibling) {
var type = c.nodeType;
wrapper = (type === 1) // Element Node
? (wrapper ? element : c)
: (type === 3) // Text Node
? (notWs.test(c.nodeValue) ? element : wrapper)
: wrapper;
}
return wrapper === element ? undefined : wrapper;
}