text: // Title:
  const titleElem = document.createElement('title');
  titleElem.textContent = title;
  document.head.appendChild(titleElem);
  
  // Fixers:
  document.body.style.touchAction  = 'none';
  document.body.style.overflow     = 'hidden';
  
  // Canvas:
  const uiCanvasElem           = document.createElement('canvas');
  uiCanvasElem.style.position  = 'fixed';
  uiCanvasElem.style.left      = '0px';
  uiCanvasElem.style.top       = '0px';
  document.body.appendChild(uiCanvasElem);
  const uiCanvasCtx = uiCanvasElem.getContext('2d', { alpha: false });
  