text: main();
  
  function main() {
  	const canvas = document.querySelector("#glcanvas");
       
      const gl = canvas.getContext("webgl");
  
      if (!gl) {
      	alert("Unable to initialize WebGL. Your browser or machine may not support it.");
          return;
      }
  
      gl.clearColor(0.0, 0.0, 0.0, 1.0);
      
      gl.clear(gl.COLOR_BUFFER_BIT);
  }
  