Function isCheckedDirty

packages/react-dom/src/__tests__/ReactDOMInput-test.js:45–54

(node)

  }

  function isCheckedDirty(node) {
    // Return the "dirty checked flag" as defined in the HTML spec.
    if (node.checked !== node.defaultChecked) {
      return true;
    }
    const copy = node.cloneNode();
    copy.type = 'checkbox';
    copy.defaultChecked = !copy.defaultChecked;
    return copy.checked === node.checked;
  }

  function getTrackedAndCurrentInputValue(elem: HTMLElement): [mixed, mixed] {
    const tracker = elem._valueTracker;