Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help http://xhr.spec.whatwg.org/
Un XMLHttpRequest síncronu nel filu principal ta desaprobáu polos sos efeutos negativos na esperiencia del usuariu final. Pa más ayuda, llei  http://xhr.spec.whatwg.org/