     import {QueryArgs} from '../js/util/query-args.js';

      // If requested, use the polyfill to provide support for mobile devices
      // and devices which only support WebVR.
      import WebXRPolyfill from '../js/third-party/webxr-polyfill/build/webxr-polyfill.module.js';
      if (QueryArgs.getBool('usePolyfill', true)) {
        let polyfill = new WebXRPolyfill();
      }

      let xrTargets = document.getElementsByName('xrTarget');

      // WebXR sample app setup
      class CustomWebXRSampleA