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High performance and SEO friendly lazy loader for images (responsive and normal), iframes and more, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.
LazyLoad is a lightweight, flexible script that speeds up your website by deferring the loading of your below-the-fold images, backgrounds, videos, iframes and scripts to when they will enter the viewport. Written in plain "vanilla" JavaScript, it leverages IntersectionObserver, supports responsive images and enables native lazy loading.
🔥 Highly performant, light ~1kb and configurable lazy loader in pure JS with no dependencies for responsive images, iframes and more
Keep iframes sized to their content
:bullettrain_front: Lazyload images, iframes, widgets with a standalone JavaScript lazyloader
Stealing CSRF tokens with CSS injection (without iFrames)
MCP Apps Host plugin for DeepSeek Harness: renders interactive HTML cards from MCP _meta.ui in sandboxed iframes, bridges postMessage to MCP tools/call and resources/read