Function isNotOverflowing

src/helpers/tabbable.js:19–25

(element, style)

const tabbableNode = /^(input|select|textarea|button|object|iframe)$/;

function isNotOverflowing(element, style) {
  return (
    style.getPropertyValue("overflow") !== "visible" ||
    // if 'overflow: visible' set, check if there is actually any overflow
    (element.scrollWidth <= 0 && element.scrollHeight <= 0)
  );
}

function hidesContents(element) {
  const zeroSize = element.offsetWidth <= 0 && element.offsetHeight <= 0;