It's not only about criss-browser, it's about the simplicity of ajax('/api/users', function(){}, 'json'); (of course, if you want to know about compatibility,

It's not only about criss-browser, it's about the simplicity of ajax('/api/users', function(){}, 'json'); (of course, if you want to know about compatibility, http://caniuse.com/#search=xmlhttprequest http://caniuse.com/#search=xmlhttprequest )