JavaScript Get Element by Multiple Class
var list = document.getElementsByClassName("class1 class2");
var list = document.querySelectorAll(".class1.class2");
Geeky Bravo
var list = document.getElementsByClassName("class1 class2");
var list = document.querySelectorAll(".class1.class2");
document.getElementsByClassName('class1 class2')
document.querySelectorAll('.a,.b')
var elems = document.getElementsByClassName("class1 class2 class3");