I am having a hard time searching for this, because I don't know what it is called. If you look here at the Big Picture they have some "objectionable images" that you can click on and view if you feel like it. Scroll down to image 6 (don't actually click if you don't want to see.)
See how it is black and then you can click it to show the image? How can I do this in html?
Thank you for your time!