RadioShack Educational Videos 3. Add a div with class html5gallery to your web page where you want to display the Gallery. Define the size of the Gallery with HTML5 tag data-width and data-height. Specify the Skin with tag data-skin. There are 7 skins to choose from: gallery, mediapage, showcase, darkness, light, vertical and horizontal . To hide all images before the Gallery is loaded, set the div's style to style="display:none;"