[javascript] Javascript Get Element by Id and set the value

<div id="This-is-the-real-id"></div>

function setText(id,newvalue) {
  var s= document.getElementById(id);
  s.innerHTML = newvalue;
}    
window.onload=function() { // or window.addEventListener("load",function() {
  setText("This-is-the-real-id","Hello there");
}

<input id="This-is-the-real-id" type="text" value="">

function setValue(id,newvalue) {
  var s= document.getElementById(id);
  s.value = newvalue;
}    
window.onload=function() {
  setValue("This-is-the-real-id","Hello there");
}

function setContent(id, newvalue) {_x000D_
  var s = document.getElementById(id);_x000D_
  if (s.tagName.toUpperCase()==="INPUT") s.value = newvalue;_x000D_
  else s.innerHTML = newvalue;_x000D_
  _x000D_
}_x000D_
window.addEventListener("load", function() {_x000D_
  setContent("This-is-the-real-id-div", "Hello there");_x000D_
  setContent("This-is-the-real-id-input", "Hello there");_x000D_
})

<div id="This-is-the-real-id-div"></div>_x000D_
<input id="This-is-the-real-id-input" type="text" value="">

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