mobile - What's the Facebook/AirBnb app design effect called? -

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i want read effect see on pages facebook or airbnb when open page , browser shows low fidelity design of page while actual data loads - you'll see grey box instead in place pictures of users be, grey rectangles instead of text content etc. i've been searching hours cannot find useful, knows name of ux practice?

i believe referred loading dummy content. there wasn't info when searched it, know basic principle first load gray background images , dummy block font wait content render.


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