<!doctype html>
<html>
  <link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
  <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-backface-visibility">
  <style>
    #flip {
      height: 100px;
      width: 100px;
      transform: rotateY(180deg);
      transform-style: preserve-3d;
    }

    #back {
      background: lightblue;
      transform: rotateY(180deg);
      position: absolute;
      top: 0;
      left: 0;
      width: 200px;
      height: 200px