Exploring the CSS scale transformation alongside the Javascript offsetHeight attribute

After combining offsetHeight with scale transformation, I experienced a strange result. Below is my simple HTML code:

  <body>
    <div id="id01">
      Some Text
    </div>
    <div id="id02" style="transform-origin: left top; transform: scale(2)">
      Some Text
    </div>
  </body>

  <script>
    var elem01 = document.getElementById('id01');
    var elem02 = document.getElementById('id02');
    alert(elem01.offsetHeight == elem02.offsetHeight);   // Always show true???
  </script>

Despite the fact that the second <div> appears twice as big as the first one on the screen, I anticipated that the second <div>'s offsetHeight would be greater than the first one.

My query is: Why does elem01.offsetHeight consistently equal elem02.offsetHeight in this scenario? Could it be that the browser does not consider the transform when calculating the element's offsetHeight?

Thank you

Answer №1

The transformation impacts the pixel ratio rather than the physical number of pixels within the Document Object Model.

For more in-depth understanding and potential resolutions, refer to this related question.

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