You can zoom the content of the iframe with this setting. E.g. entering 0.5 does resize the iframe to 50%. At the iframe width and height you need to enter the FULL size of the iframe. So if you enter width = 1000, height = 500 and zoom = 0.5 than the result will be 500x250. "Show only a part of an iframe" and "Resize iframe to content height" are supported. Shortcode attribute: iframe_zoom=""