HaxeJS comes with a built in JQuery extern, so you can basically make a page the same way you would with a JS/JQuery frontend, but you get the language feature

HaxeJS comes with a built in JQuery extern, so you can basically make a page the same way you would with a JS/JQuery frontend, but you get the language feature and type checking benefits of Haxe. JQuery should handle all your front-end cross-browser issues. Also, you can do your backend in Haxe, and target the NekoVM (via mod_neko (single thread per request) or mod_tora (multi-threaded) for Apache) or NodeJS. Haxe could do this long before Dart showed up.