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self.onmessage = function(e) {
const offscreen = e.data.canvas;
offscreen_ctx = offscreen.getContext('2d');
let test_font = new FontFace(
// Lato-Medium is a font with language specific ligatures.
"Lato-Medium",
"url(/fonts/Lato-Medium.ttf)"
);
test_font.load().then((font) => {
self.fonts.add(font);
offscreen_ctx.font = '25px Lato-Medium';
offscreen_ctx.lang = 'tr';
offscreen_ctx.fillText('fi', 5, 50);
// Draw a single pixel, used to detect that the worker has completed.
offscreen_ctx.fillStyle = '#0f0';
offscreen_ctx.fillRect(0, 0, 1, 1);
});
}