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diff: @@ -7,8 +7,10 @@ import { Capabilities, ViewportQuad, TexturedViewportQuad } from "@bentley/imode
  function getCanvas(): HTMLCanvasElement | undefined {
  let canvas = document.getElementById("canvas") as HTMLCanvasElement | undefined;
  if (null === canvas)
  - canvas = document.createElement("canvas") as HTMLCanvasElement | undefined;
  - return canvas;
  + canvas = document.createElement("canvas") as HTMLCanvasElement;
  +
  + const gl = canvas!.getContext("webgl");
  + return gl ? canvas : undefined;
  }
  describe("System WebGL Capabilities", () => {
  