File: canvas_scale.html

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<!doctype html>
<meta charset="utf-8">
<title>Verify that canvases are scaled up to their computed size</title>
<link rel="match" href="canvas_scale_ref.html">
<style>
canvas {
  width: 20px;
  height: 20px;
}
div {
  line-height: 0;
}
</style>
<div><canvas width="16" height="16" data-color="#FF00FF"></canvas><canvas width="16" height="16" data-color="#00FF00"></canvas></div>
<div><canvas width="16" height="16" data-color="#0000FF"></canvas><canvas width="16" height="16" data-color="#FF00FF"></canvas></div>
<script>
var canvases = document.getElementsByTagName('canvas');
for (var i = 0; i < canvases.length; i++) {
  var ctx = canvases[i].getContext('2d');
  ctx.fillStyle = canvases[i].getAttribute('data-color');
  ctx.fillRect(0, 0, 16, 16);
}
</script>