meaning of null at inner html code example

Example 1: change innerhtml

document.getElementById("p1").innerHTML = "New text!";

Example 2: Cannot set property 'innerHTML' of null

/* Answer to: "Cannot set property 'innerHTML' of null" */

window.onload = function (){
	...
}

/*
  Make sure the <script> tag, containing the javascript is at the
  bottom of the <body> tag.
  
  As long as the <script> tag is below the element it's trying to
  find, the JavaScript should work.
  
  However, if you don't want to be the <script> at the bottom of
  your <body> tag. Wrap your javascript with:
*/

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