I think you’re way off here. The basic consistency of parsing between browsers is absolutely the result of the HTML 5 standard. Polyfills and transpilation are

I think you’re way off here. The basic consistency of parsing between browsers is absolutely the result of the HTML 5 standard. Polyfills and transpilation are rarely necessary in modern web dev. (Transpilation can improve your dev experience, but you can easily get by in a pinch with the JS features that modern browsers support natively.)