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Complementary HSL

  1. const a = document.body.appendChild(document.createElement('div')),
  2.       b = document.body.appendChild(document.createElement('div'));
  3. let degA = degB = 0;
  4.  
  5. const size = {
  6.   width: '100px',
  7.   height: '100px'
  8. };
  9. Object.assign(a.style, size);
  10. Object.assign(b.style, size);
  11.  
  12. function loop() {
  13.   degA += 1;
  14.   degB = degA + 180;
  15.   a.style.background = `hsl(${degA}deg, 100%, 50%)`;
  16.   b.style.background = `hsl(${degB}deg, 100%, 50%)`;
  17.   requestAnimationFrame(loop);
  18. }
  19. loop();

In HSL a hue difference of 180 degrees between two values will create a set of complimentary colors.

// animation // color // css // dom // javascript // tricks // ui
snippet.zone ~ 2021-22 /// {s/z}