<!DOCTYPE html>
<html>
  <title>CSS aspect-ratio: canvas with aspect-ratio and contain:size</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="https://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5550">
  <link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
  <meta name="assert" content="This test verifies aspect-ratio's <ratio> is used to determine the canvas' size because contain:size enforces no intrinsic aspect ratio.">

  <style>
  canvas {
    width: 100px;
    aspect-ratio: 1/1;
    contain: size;
  }
  </style>

  <script>
  window.onload = function() {
    const canvas = document.querySelector('canvas');
    const ctx = canvas.getContext('2d');
    ctx.fillStyle = 'green';
    ctx.fillRect(0, 0, 200, 200);
  }
  </script>

  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
  <canvas width=200 height=200></canvas>
</html>
