WebGL

let squareRotation = 0.0;
let deltaTime = 0;

function drawScene(gl, programInfo, buffers, squareRotation) {

mat4.rotate(
  modelViewMatrix, // 
  modelViewMatrix, // 
  squareRotation, // 
  [0, 0, 1],
); // 

let then = 0;

// 
function render(now) {
  now *= 0.001; // 
  deltaTime = now - then;
  then = now;

  drawScene(gl, programInfo, buffers, squareRotation);
  squareRotation += deltaTime;

  requestAnimationFrame(render);
}
requestAnimationFrame(render);