JPEG allows for additional data chunks (that's how thumbnails, EXIF data, ... are added). The HTML uses CSS to hide the "body" (since that would include the JPE

JPEG allows for additional data chunks (that's how thumbnails, EXIF data, ... are added). The HTML uses CSS to hide the "body" (since that would include the JPEG header), putting the real content in a container element that poses as new root. Neat hack.