DavidBruant

var els = document.querySelectorAll('a');
els.forEach(function(e){console.log(e.href);}); // TypeError: els.forEach is not a function

// Why?

// document.querySelectorAll returns a NodeList.
// First thing first, as opposed to other NodeList, this one is not live, mostly because the 
// implementation of a live object would be terribly complicated for some selectors

// NodeList are a DOM interface introduced in DOM core level 1 (random guess)