Function isContentOverflowing

scripts/smoothScroll.js:663–667

(el, x)

    } while ((el = el.parentElement));
  }
  function isContentOverflowing(el, x) {
    return x
      ? el.clientWidth + 10 < el.scrollWidth
      : el.clientHeight + 10 < el.scrollHeight;
  }
  function computedOverflow(el, x) {
    let property = x ? "overflow-x" : "overflow-y";
    return getComputedStyle(el, "").getPropertyValue(property);