<canvas id="canvas" width="1024" height="600"></canvas>
<script type="text/JavaScript">
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var gradient=ctx.createLinearGradient(0, 0, 0, 200);
gradient.addColorStop(0, "black");
gradient.addColorStop(1, "white");
ctx.fillStyle=gradient;
ctx.fillRect(10, 10, 170, 100);
/*
run:
*/
</script>