code: function applyAspectRatioPadding(image) {
    var ratioPadding = (image.knownDimensions[1] / image.knownDimensions[0]) * 100.0;
    DOM.setStyle(image.element, 'paddingBottom', ratioPadding + '%');
  }
docs: Set a padding percentage which allows the image to scale proportionally.
  @param {ResponsiveImage} image The image data.