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<!DOCTYPE html>
<meta charset="utf-8">
<div style="width: 100px; height: 100px;">
<canvas id="c" width="100" height="100"></canvas>
</div>
<script>
var ctx = document.getElementById('c').getContext('2d');
var grd = ctx.createLinearGradient(0, 0, 100, 0);
grd.addColorStop(0, 'black');
grd.addColorStop(1, 'white');
ctx.fillStyle = grd;
ctx.fillRect(0, 0, 100, 100);
ctx.globalCompositeOperation = 'luminosity';
ctx.globalAlpha = 0.8;
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, 100, 100);
</script>
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