Above there must be nine scalable child objects (blue ellipses) on a 3 by 3 grid, where each horizontal line (3 ellipses) must occupy 100% of the available width and each vertical line (3 ellipses) must occupy 100% of the available height.
CSS settings: html, body and div elements are set to height:100%, the object height is set to 33.33%.
This raster image screenshot shows the desired rendering.