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/
Synchrony XMLHttpRequest na głownej nitce jo zestarjony skódnych efektow na dožywjenje kóńcnego wužywarja dla. Za dalšnu pomoc glejśo http://xhr.spec.whatwg.org/