Check browser support for position sticky

check-sticky-support.js

function checkStickySupport() {
  const el = document.createElement('a');
  el.style.cssText =
    'position:sticky; position:-webkit-sticky; position:-ms-sticky;';
  return el.style.position.indexOf('sticky') !== -1;
}

const isStickySupported = checkStickySupport();