<!DOCTYPE html>
<meta charset=utf-8>
<link rel=match href=lineto_ref.html>
<style>
  html, body {
    margin: 0;
    padding: 0;
  }
</style>
<canvas id="c" width="150" height="150" >
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c = document.getElementById("c");
var ctx = c.getContext("2d");

ctx.beginPath();
ctx.moveTo(20, 20);
ctx.lineTo(20, 130);
ctx.lineTo(130, 130);
ctx.lineTo(130, 20);
ctx.closePath();

ctx.fillStyle = '#90EE90';
ctx.fill();
</script>