User:BI613en/hide-images.css

img { visibility:hidden; }

img.hide-images-handled { visibility:visible; }

span.hide-images-wrapper { background:url(//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Linear_Grayscale_Gradient_%28Vertical%29.svg/40px-Linear_Grayscale_Gradient_%28Vertical%29.svg.png) repeat; background-size:contain; outline:2px solid red; cursor:pointer; display:inline-block; }

span.hide-images-wrapper img.hide-images-handled { visibility:hidden; }