I'm building a web app, and tested the app against all those browser. The behavior is really different, especially regarding the implementation a newly develope

I'm building a web app, and tested the app against all those browser. The behavior is really different, especially regarding the implementation a newly developed web api and the depreciation plan of ancient javascript api. For example, xhr depreciation [1]. As for chromium, they are quite responsive in responding the developer inquiries regarding a browser-specific API implementation. [2][3] Sadly, it's IE vs Netscape all over again. [1] : https://xhr.spec.whatwg.org/#the-open()-method https://xhr.spec.whatwg.org/#the-open()-method [2] :https://groups.google.com/a/chromium.org/g/chromium-discuss https://groups.google.com/a/chromium.org/g/chromium-discuss [3] : https://www.researchgate.net/publication/353527090_Rancang_Bangun_Aplikasi_Note-Taking_Berbasis_Wiki https://www.researchgate.net/publication/353527090_Rancang_B... (it contains my communication excerpts to the Chromium team, regarding xhr deprecation plan)