<!doctype html>
<title>CSS Test: preserve-3d on buttons</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="preserve3d-button-ref.html">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1491864">
<style>
.scene {
  width: 200px;
  height: 200px;
  perspective: 5000px;
}

.card {
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  position: relative;
  background: none;
  border: 0;
  padding: 0;
  transform: rotateY(180deg);
}

.face {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background: red;
}

.backface {
  background: green;
  transform: rotateY(180deg);
}
</style>
<div class="scene">
  <button class="card">
    <div class="face"></div>
    <div class="face backface"></div>
  </button>
</div>