<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Reference File</title>
<p>Pass if square canvas below is completely green.</p>
<canvas width="400" height="400"></canvas>
<script>
const canvas = document.querySelector("canvas");
const context = canvas.getContext('2d');

context.fillStyle = 'rgb(0, 255, 0)';
context.fillRect(0, 0, canvas.width, canvas.height);
</script>