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Deep-dive teardown series with first-hand measurements. Each series is a curriculum: read it end-to-end and you can build the thing yourself.

Designing a script-tag JS SDK: teardowns of five real products

Fetch and read the actual CDN-delivered bundles of YouTube, Safie, Vimeo, Mux Player, and Video.js. Reading five different SDKs side by side reveals the design axes — loader/body split, iframe isolation, postMessage contract, version pinning — that every embeddable JS SDK has to answer.

2 chapters / 2026-08-08 / sdk · cdn · javascript · browser · architecture