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<!DOCTYPE HTML>
<html>
<title>Mask layer on canvas layer needs to update even if canvas wasn't dirtied</title>
</style>
<canvas id="canvas" height="100" width="200" style="border-radius: 40px;"></canvas>
<script>
var canvas = document.getElementById("canvas");
var cx = canvas.getContext("2d");
cx.fillStyle="lime";
cx.fillRect(0, 0, 200, 100);
</script>