JavaScript window.body.scrollHeight does not change when decreasing height window.body.scrollheight,window.document.body.scrollheight,window.scrollto(document.

So I am trying to create a way to detect when the body resizes and then I grab the new height and send it through a postmessage. The not correctly functioning part is when I downsize the body ( when I removed(hide) some elements so the body shrunk). This does not get detected as the window.body.scrollHeight simply holds the last value. Here is my code and I would appreciate any suggestions:

  sendMessage();
  checkDocumentHeight(sendMessage);
  function sendMessage(){
    var heightWidth = document.body.scrollHeight+ " " +document.body.scrollWidth;
    parent.postMessage(heightWidth, "*");
  }
  function checkDocumentHeight(callback){
      var lastHeight = document.body.scrollHeight, newHeight, timer;
      (function run(){
          newHeight = document.body.scrollHeight;
          if( lastHeight != newHeight )
              callback();
          lastHeight = newHeight;
          timer = setTimeout(run, 1000);
      })();
  }

Answer:1

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