gistfile1.txt

function parseColor(colorStr) {
  if (!this.div) {
    this.div = document.createElement('div');
    this.div.style.hidden = true;
    document.body.appendChild(this.div)
  }
  
  this.div.style.color = colorStr;
  if (this.div.style.color === "")
    this.div.style.color = `#${colorStr}`;
  
  let style = window.getComputedStyle(this.div);
  let colors = style.color.match(/\d+/g).map(a => parseInt(a, 10));
  
  return new Uint8Array(colors);
}

function withdelay(values, delay) {
  return { 
    [Symbol.iterator]: function* () {
      for (let i of values) {
        yield new Promise(resolve => {
          setTimeout(_ => resolve(i), delay);
        });
      }
    }
  };
}

async function run() {
  for (let color of withdelay(["red", "purple", "blue"], 500)) {
    console.log(parseColor(await color)); 
  }
}

//run()

async function run2() {
  for (let color of ["green", "yellow", "rebeccapurple"]) {
    let c = await new Promise(resolve => {
      setTimeout(_ => resolve(color), 1000);
    })
    console.log(parseColor(c));
  }
}

run2()

// noprotect