<!DOCTYPE HTML>
<title>backface-visibility test</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#3d-transform-rendering">
<link rel="match" href="/common/blank.html">
<meta name="assert" content="The backface-visibility property still works correctly when there is an element outside the 3-D rendering context that is, in tree order, in between the element with backface-visibility and the root of the 3-D Rendering Context">

<style>

div {
  width: 100px;
  height: 100px;
}

#outer {
  transform-style: preserve-3d;
  transform: rotateX(120deg);
  position: relative;
}

#outer > div {
  position: absolute;
  top: 0;
  left: 0;
}

#grandchild {
  transform: translateZ(1px);
}

#child2 {
  transform-style: preserve-3d;
  transform: translateX(0);
  backface-visibility: hidden;
  background: red;
}

</style>

<div id="outer">
  <div id="child1"><div id="grandchild"></div></div>
  <div id="child2"></div>
</div>