<ul><li><b>Image to iframe</b> will hide iframe behind image till toggled.</li><li><b>Image to lightbox</b> (Colorbox, Photobox, PhotoSwipe) <b>requires</b> a grid to build the gallery correctly. Add <code>data-column="1 3 4"</code> or <code>data-grid="1 3 4"</code> to the first image/ iframe only.</li></ul>