Fix offscreencanvas undefined (#11017)
* Suppress ReferenceError on some environments (i.e. older iOS) * fix * fix * lint * adopt suggestion by acid-chicken
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@ -1,5 +1,5 @@
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const canvas = new OffscreenCanvas(1, 1);
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const gl = canvas.getContext('webgl2');
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const canvas = globalThis.OffscreenCanvas && new OffscreenCanvas(1, 1);
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const gl = canvas?.getContext('webgl2');
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if (gl) {
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postMessage({ result: true });
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} else {
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