<!DOCTYPE html>
<title>transform-box: fill-box on an SVG container element</title>
<link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-box">
<link rel="match" href="reference/greensquare200x200.html">
<style>
#container {
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(2);
}
</style>
<p>There should be a green 200x200 rectangle below, and no red.</p>
<svg width="200" height="200">
  <rect width="200" height="200" fill="red"/>
  <g id="container">
    <rect x="