Function isCheckable

docs/external/js/react-dom.development.js:1806–1810

(elem)

  }

  function isCheckable(elem) {
    var type = elem.type;
    var nodeName = elem.nodeName;
    return nodeName && nodeName.toLowerCase() === 'input' && (type === 'checkbox' || type === 'radio');
  }

  function getTracker(node) {
    return node._valueTracker;