Below the Fold
ELI5 — The Vibe Check
Below the Fold is everything on a webpage you have to scroll down to see. Content here can load lazily since users won't see it immediately. It's the 'we'll get to it when we get to it' zone of your website — still important, just not first-impression important.
Real Talk
Below the fold refers to web page content that is not visible in the initial viewport and requires scrolling. Resources in this area are candidates for lazy loading, deferred JavaScript, and lower priority fetching to optimize initial page load performance.
When You'll Hear This
"Lazy load all images below the fold" / "Below-the-fold content can use loading='lazy' to defer its network requests"
Related Terms
Above the Fold
Above the fold is everything you see before scrolling — like a newspaper's front page headline. It's prime real estate.
Intersection Observer
Intersection Observer watches elements and tells you when they enter or leave the viewport. It's the bouncer checking if components are visible.
Lazy Loading
Lazy loading waits until you actually access related data before fetching it. Access post.author and only then does it query the database.