query selector all is not slecting classes after newly added dom via js code example

Example 1: document.queryselectorall extract all href element

[].forEach.call( document.querySelectorAll('img.PinImageImg'), 
function  fn(elem){ 
    console.log(elem.src);
});

Example 2: document.queryselector

<div id="foo\bar"></div>
<div id="foo:bar"></div>

<script>
  console.log('#foo\bar');               // "#fooar" (\b is the backspace control character)
  document.querySelector('#foo\bar');    // Does not match anything

  console.log('#foo\\bar');              // "#foo\bar"
  console.log('#foo\\\\bar');            // "#foo\\bar"
  document.querySelector('#foo\\\\bar'); // Match the first div

  document.querySelector('#foo:bar');    // Does not match anything
  document.querySelector('#foo\\:bar');  // Match the second div
</script>