Element.getBoundingClientRect() on dom with applied CSS3 perspective Property return DOMRect object as before transformation
<p>I would like to know if it is possible to return coordinates for a div being transformed using CSS3 perspective property using <code>Element.getBoundingClientRect()</code> <a href="https://developer.mozilla.org/en/docs/Web/API/Element/getBoundingClientRect" rel="nofollow noreferrer">Ref</a>.</p>

<p>I notice that <code>Element.getBoundingClientRect()</code> works fine for CSS 3 Transforms like <code>scale()</code> <code>skewX()</code>, but when <code>perspective</code> is applied, values returned (<a href="https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDOMClientRect" rel="nofollow noreferrer">DOMRect</a>) do not match the dom element size after the transformation.</p>

<p>In my case I need to make sure that div with id <code>bb</code> has the width/height/top/left position on top of the bounding box for the element after the CSS transformation (as you see now the blue box match the element before transformation).</p>

<p>Any idea is welcome.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var elm = document.querySelector('#div2');
var elmBb = document.querySelector('#bb');
var rect = elm.getBoundingClientRect();
//console.log(rect);
elmBb.style.top = rect.top + 'px';
elmBb.style.left = rect.left + 'px';
elmBb.style.width = rect.width + 'px';
elmBb.style.height = rect.height + 'px';</code></pre>
<pre class="snippet-code-css lang-css prettyprint-override"><code>#div1 {
  position: fixed;
  height: 150px;
  width: 150px;
  margin: 50px;
  padding: 10px;
  border: 1px solid black;
  perspective: 150px;
}

#div2 {
  padding: 50px;
  position: absolute;
  border: 1px solid black;
  background-color: red;
  transform: rotateX(45deg);
}

#bb {
  position: fixed;
  border: 1px solid blue;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="div1"&gt;
  &lt;div id="div2"&gt;HELLO&lt;/div&gt;
&lt;/div&gt;
&lt;div id="bb"&gt;&lt;/div&gt;</code></pre>
</div>
</div>
</p>