Get all input fields inside div (without JS library)

Question

What's the easiest way to get all input fields inside a div without using a javascript library like jQuery? Similar to this jQuery snippet:

var inputs = $('#mydiv :input');

Answer 1

getElementsByTagName

Answer 2

document.getElementById('mydiv').getElementsByTagName('input')

Answer 3

Try:

var inputs = document.getElementById('mydiv').getElementsByTagName('input');

Answer 4

document.getElementById("mydiv").getElementsByTagName("input");