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Introduction
Web API
TODO
Media Source Extentions
WebRTC
Intersection Observer API
1.Concepts&Usage
2.Polyfill
IndexedDB
getUserMedia
Skills
TODO
Simple eventEmitter
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GitBook
2.Polyfill
IntersectionObserver
https://github.com/w3c/IntersectionObserver
polyfill
https://github.com/w3c/IntersectionObserver/tree/master/polyfill
file
https://github.com/w3c/IntersectionObserver/blob/master/polyfill/intersection-observer.js
cdn.profill.io
https://cdn.polyfill.io/v3/
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IndexedDB
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IntersectionObserver
polyfill
file
cdn.profill.io
