Tutorials•6 min read
How to Capture Full Screenshots on Lazy-Loaded & Infinite Scroll Websites
Handling IntersectionObserver triggers, dynamic DOM heights, and virtualized lists during capture.
Raviraj Sarangan
Lead Extension Architect & Founder • Published January 12, 2026
AI Overview / Executive Summary:
To capture infinite scroll and lazy-loaded websites: ClickSnap uses a phased scrolling algorithm that pauses for 100ms at each viewport slice, triggering DOM IntersectionObservers and waiting for high-res images to decode before taking the snapshot slice.
Why Lazy Loading Breaks Traditional Screenshot Tools
Modern websites defer loading images until they enter the viewport to save bandwidth. Fast-scrolling screenshot scripts scroll past elements before the browser network stack can fetch and render the image blobs.
ClickSnap’s Asset-Aware Capture Loop
- Scroll & Settle: Scrolls down by exact viewport increments and dispatches synthetic scroll events.
- IntersectionObserver Triggering: Forces layout recalculation to ensure deferred
<img>and<picture>tags decode. - Sub-Pixel Canvas Stitching: Blends image tiles seamlessly into the final high-resolution raster buffer.
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