Is this a chrome bug?

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Can anyone confirm "getBoundingClientRect" has a bug Chrome?

<!DOCTYPE html>
<html>
<head>
  <style>
  body {
    margin: 0;
  }
  .main {
    width: 200px;
    height: 200px;
    background-color: gray;
    padding: 20px;
  }
  #box {
    width: 100px;
    height: 100px;
    zoom: 10%;
    background-color: red;
  }
  </style>
</head>

<body>
  <div class="main">
    <div id="box">box</div>
  </div>
  <script>
    console.log(document.getElementById('box').getBoundingClientRect());
    document.write(`<p>left: ${document.getElementById('box').getBoundingClientRect().left}</p>`);
    // left and top should be 20, but they are 200. They are divided by element's "zoom" attribute.
  </script>
</body>
</html>

What I have tried:

I get different results for Chrome and Edge, and I understand Chrome is wrong.
Edge returns 20, Chrome returns 200.

Posted 9-Nov-20 3:24am

Gabriel 2

Updated 9-Nov-20 4:32am

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Richard Deeming · Answer 1 · 2020-11-09T04:34:00

Not sure how you've got Edge to return 20 - are you still on the old version?

Demo[^]

Firefox 82 displays 20;
Edge 86 displays 200;
Chrome 86 displays 200;

This appears to be connected to the zoom property. If you comment out the property, Chrome and Edge both report 20:
Updated demo[^]

NB: zoom is a non-standard property, with limited browser support. It is not supported in Firefox or the old version of Edge.
zoom - CSS: Cascading Style Sheets | MDN[^]

It looks like there is no consensus about how this property should interact with the bounding rect:
429140 - chromium - An open-source project to help move the web forward. - Monorail[^]

You should consider using transform:scale() instead of zoom. However, this will not affect the layout size of the element.

With transform:scale(0.1) replacing zoom:10%, all three browsers return the same value:
Demo[^]