how lightboxes for pics works? they use iframes? how they download pics? [closed]

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how lightboxes for pics works? they use iframes? how they download pics?

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This is similar to a modal dialog. A translucent overlay is put over the entire screen. A DIV is placed over top of the overlay that displays the picture and controls. Images are usually supplied as a list. It's all JavaScript and CSS. JavaScript is used to flip the images.

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Usually just by creating an <img> element with JS and DOM.