onst height = window.innerHeight * window.devicePixelRatio

      const canvas = document.querySelector('#canvas')
      canvas.width = width
      canvas.height = height

      const gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl')

      if (!gl) {
        alert('–ù–µ —É–¥–∞–ª–æ—Å—å –∏–Ω–∏—Ü–∏–∞–ª–∏–∑–∏—Ä–æ–≤–∞—Ç—å WebGL. –í–∞—à –±—Ä–∞—É–∑–µ—Ä –∏–ª–∏ �