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Dennis Morello
@morello.dev

Loading React from a public CDN used to mean a visitor probably already had it from another site. Browsers killed that in 2020 to stop cache-timing tracking, so every site now downloads its own copy. The Cross-Origin Storage API keys files by hash to bring sharing back: #webdev #javascript

morello.devCross-Origin Storage API: Stop Downloading Files TwiceThe Cross-Origin Storage API lets sites share one cached copy of a file (a JS library, font, or AI model) across origins by SHA-256 hash. Here's how it works.
Dennis Morello
@morello.dev

The privacy design is the clever part. To stop 'do you have file X?' from becoming a tracking probe, the browser will report a rare file as absent even when it has it, and only confirms files popular enough across enough origins to stay anonymous.

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