title: How do I send value from child page to parent page
body: <p>I have a page named <code>parent.html</code>. From there I call a modal dialog <code>child.html</code>.
  I have a link button in <code>child.html</code> to close the modal dialog. At the same time I want to pass value from <code>child.html</code> to <code>parent.html</code>.</p>
  
  <p>How do I send the value from the child page to the parent page?</p>