Function isFixed

app/src/static/js/react-bootstrap.js:3535–3553

* Check if the given element is fixed or is inside a fixed parent * @method * @memberof Popper.Utils * @argument {Element} element * @argument {Element} customContainer * @returns {Boolean} answer to "isFixed?"

(element)

function isFixed(element) {
  var nodeName = element.nodeName;

  if (nodeName === 'BODY' || nodeName === 'HTML') {
    return false;
  }

  if (getStyleComputedProperty(element, 'position') === 'fixed') {
    return true;
  }

  var parentNode = getParentNode(element);

  if (!parentNode) {
    return false;
  }

  return isFixed(parentNode);
}
/**
 * Finds the first parent of an element that has a transformed property defined
 * @method