1801588-1.html - mozsearch

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<!DOCTYPE html>

<html>

  <body>

    <canvas id="canvas" width="100" height="100"></canvas>

    <script>

  var c = document.getElementById("canvas");

  var ctx = c.getContext("2d");

  ctx.fillStyle = "red";

  ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);

  ctx.globalCompositeOperation = "copy";

  ctx.fillStyle = "green";

  ctx.fillRect(0, 0, 50, 50);

    </script>

  </body>

</html>