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<!doctype html>
<meta charset="utf-8">
<style>
body { margin: 0 }
canvas { display: block }
</style>
<canvas id="canvas" width="80" height="80"></canvas>
<script>
document.getElementById("canvas").mozPrintCallback = obj => {
// Take a while before calling obj.done(), to mimic asynchronous rendering
// work, so that a print job which doesn't wait for us finishes first.
setTimeout(() => {
obj.context.fillStyle = "green";
obj.context.fillRect(0, 0, 80, 80);
obj.done();
}, 1000);
};
</script>