How do you get elements from a javascript HTMLCollection

Taken from : Can't access the value of HTMLCollection

The problem is you have placed the script in the header which gets executed before the html elements are loaded, so getElementsByClassName() will not return any elements.

One solution is to wait for the html elements to be loaded then execute your script, for that you can use the window objects load event

window.addEventListener('load', function () {
var eles = document.getElementsByClassName('review');
console.log(eles);
console.log(eles.length);
console.log(eles[0]);
})

Or you can place your script at the bottom of the body element instead of in head so that by the time the script is parsed and executed the elements are loaded in the dom