Gif Image Masking
Bacon ipsum dolor amet bresaola ground round tail pork belly shankle shank short loin. Tongue ham pork chop flank, fatback pork belly leberkas boudin bacon meatloaf frankfurter jowl tail. Leberkas jerky cow spare ribs tenderloin boudin.
Beef ribs tri-tip ball tip ham hock cupim hamburger. Doner chicken fatback, cow tenderloin biltong bacon. Jowl flank porchetta sirloin salami biltong turducken buffalo short ribs. Beef ribs cow ground round, beef meatloaf pig pork chop.
What's happening?
The background div is blended with the foreground div based on a gif mask that's inverted using CSS in the foreground version.
The mask being used;