In modern JavaScript development, we often use some cutting-edge features, which are usually in the "Stage 0" stage of JavaScript language proposals. This means they have not become formal language specifications yet, but we can compile them into code compatible with all browsers through tools such as Babel. Once upon a time, even the basic features of ES6 were in the experimental stage, developers needed to compile arrow functions, etc. into ES5 code to use in production environments. But now, ES6 (ES2015) has long become the standard and has received widespread support.
Browser compatibility remains a major challenge, especially for older IE browsers. But that doesn't mean we need to provide ES5 code for all browsers. This is what "Differential Serving" means.
How to implement differentiated services? A clever way is to use HTML
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