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self.onmessage = function(e) {
offscreen = e.data.canvas;
offscreen_ctx = offscreen.getContext("2d");
offscreen_ctx.font = "25px serif";
offscreen_ctx.fillText("ABC!", 60, 50);
// Fill a pixel, used to detect when the worker has completed.
offscreen_ctx.fillStyle = '#0f0';
offscreen_ctx.fillRect(0, 0, 1, 1);
}