This is a lot of HTML code related to preloading images on a Facebook page, specifically for a video. Here’s a breakdown of what’s happening:
* <link rel="preload" ...>: These tags tell the browser to start downloading these image resources before they are actually needed to display the page. This speeds up the user experience by reducing loading times.
* as="image": This attribute tells the browser that the linked resource is an image.
* data-preloader="...": This attribute is used by Facebook’s internal scripts to identify wich image is being preloaded and where it’s used (e.g., for a video hero, auxiliary elements, etc.). The {N} part likely represents a dynamic number used for tracking.
* href="...": This attribute contains the URL of the image. The URLs all point to scontent-hel3-1.xx.fbcdn.net, which is a Facebook content delivery network (CDN).
* long URLs with Parameters: The URLs are very long and include a lot of parameters after the ?. These parameters are used by facebook to control how the images are served (e.g., size, quality, type, caching, security measures). Parameters like stp, _nc_cat, ccb, _nc_sid, _nc_ohc, _nc_oc, _nc_zt, _nc_ht, _nc_gid, oh, and oe all serve specific purposes within Facebook’s system.
* Image sizes and Types: The URLs specify image sizes like s80x80, s960x960, and also image types like .jpg and .webp.
In essence, this code snippet is optimizing the loading of images on a Facebook video page to make it load faster and provide a smoother user experience. Facebook uses preloading of these thumbnails and related images associated with a video to ensure they appear quickly when the user scrolls or interacts with the video.
