일반 브라우저별 Javascript ECMA Script 지원 스펙 레퍼런스 링크

- Microsoft 의 IE 및 Edge
    -> Microsoft JavaScript Version Information
    -> https://docs.microsoft.com/ko-kr/microsoft-edge/dev-guide/whats-new/javascript-version-information?redirectedfrom=MSDN
- Google Chrome V8 Information
    -> https://v8.dev
- Firefox JavaScript changelog
    -> https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/Firefox_JavaScript_changelog
- Safari ECMAScript 6 in WebKit
    -> https://webkit.org/blog/4054/es6-in-webkit
- 사설커뮤니티에서 작성된 브라우저별 ecma compatibility table
    -> https://kangax.github.io/compat-table/es5
    -> https://kangax.github.io/compat-table/es6