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How do you build a web that inspires 600 million users? At Pinterest, the "Close Up" experience is core to how users discover ideas. But over time, the JavaScript powering carousel experience became a patchwork of 2,000 lines of code—resulting in noticeable lag and "jank" for users.
In this video, Pinterest engineers Calvin and Anuja walk through how they swapped legacy JavaScript for modern CSS carousels and View Transitions. The results? A 90% reduction in code, a 15% improvement in page load time, and a smoother, native-feeling UI.
Chapters:
[0:07] Inspiring 600 Million Users
[0:10] Meet the team: Engineering at Pinterest
[0:21] The legacy carousel: 2,000 Lines of JavaScript
[0:49] The Experiment: Converting to CSS carousel
[1:22] Results: 90% less code, 15% less load time.
[1:36] Scaling success everywhere
[2:03] View Transitions: Smooth animations are now possible
📚Resources:
Make accessible carousels →
Carousels with CSS →
Scoped View Transitions →
View Transition API →
Watch more “Re-Imagine the web” →
Subscribe to Chrome for Developers →
#Chrome #Pinterest #webui
Products Mentioned: Chrome, Pinterest, web platform, web development, CSS, CSS carousels, CSS primitives, View Transitions
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2026/03/17
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