code: function postEmbedHeightToViewer() {
    var newHeight = document.getElementById('tabinterface').clientHeight;
    if (newHeight < MIN_IFRAME_HEIGHT) {
      console.log('embed height too small, reset height to 100px');
      newHeight = MIN_IFRAME_HEIGHT;
    }
    // Tell the viewer about the new size
    window.parent.postMessage({
      sentinel: 'amp',
      type: 'embed-size',
      height: newHeight
    }, '*');
  }
docs: Post a message containing the document height to the amp-iframe to trigger the resize.