Why not sending JavaScript files in browser-specific bytecode? [closed]

Answer 1

• All engines would need to make their byte code format public
• The server would need to hold very many different byte code files, or even compile them on the fly
• Browser detection is fraught with peril (user agents lie, proxies cache)
• Bytecode rules might change between minor versions of a browser
• The performance gains probably wouldn't be all that significant (especially when compared to network transfer times)