generated at
ECMAScript
JavaScriptの仕様

ECMAScriptの使い方
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https://adrianmejia.com/overview-of-javascript-es6-features-a-k-a-ecmascript-6-and-es2015/#JavaScript-History
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最近何入りそうなの？
tc39/proposals: Tracking ECMAScript Proposals を見よ

策定プロセスは5段階
https://tc39.es/process-document/