Test attribute vs id selection

selectorTest.js

var id = getRandomInt();
var div = document.createElement('div');
    div.setAttribute('id', id);
var reps = 100;

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}

function selectByAttribute(reps) {
  console.time('selectByAttribute');
  for(i=0; i<reps; i++) {
    document.querySelectorAll('[id=' + id + ']');
  }
  console.timeEnd('selectByAttribute');
}

function selectById(reps) {
    console.time('selectById');
    for(i=0; i<reps; i++) {
        document.querySelectorAll('#'+id);
    }
    console.timeEnd('selectById');
}