File: transform-style-stacking-context.html

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<!DOCTYPE HTML>
<title>'transform-style: preserve-3d' establishes a stacking context.</title>
<link rel="author" title="Psychpsyo" href="mailto:psychpsyo@gmail.com">
<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#transform-style-property">
<link rel="match" href="transform-lime-square-ref.html">
<style>
  div {
    width: 100px;
    height: 100px;
  }
  #front {
    background-color: lime;
    /* makes a stacking context and puts this on top */
    position: absolute;
    z-index: 10;
  }
  #back {
    transform-style: preserve-3d;
  }
  #notOnTop {
    background-color: red;
    /* z-index is higher than on #front, but this should still be covered up because it is inside #back, which has 'transform-style: preserve-3d' */
    position: absolute;
    z-index: 1000;
  }
</style>
<div id="front"></div>
<div id="back">
  <div id="notOnTop"></div>
</div>