Learn
One subject, split across several parts, followed all the way down. Each series is a curriculum: read it through and you end up able to build the thing yourself.
- What goes in here
- The shipped bundles of five embeddable JavaScript SDKs, fetched and read line by line. What I ran and verified myself is marked apart from what I only assessed from the vendor's own documentation, and chapter 0 of each series says which is which.
- Reading order
- Start at chapter 0. It carries the comparison table and a list of what each chapter covers. After that, jump to the chapter you care about or read straight through. Order only matters for chapter 0.
- How this differs from the blog
- The blog is one post, one subject, done. This section takes the subjects that will not fit in one post. Comparing five SDK designs needs a chapter per design; compressed into one post, every one of them stays at the surface.
Series
1 series / 2 chapters-
How to build a JavaScript SDK: 5 real teardowns
Take apart the CDN bundles of YouTube, Safie, Vimeo, Mux Player and Video.js, measured 2026-08-08. Five teardowns expose the axes they disagree on.
CONTENTS
More series, and more chapters per series, are published in Japanese at kenimoto.dev/ja/learn.