Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help https://xhr.spec.whatwg.org/#sync-warning
Synchrony XMLHttpRequest na hłownej nitce je zestarjeny skódnych efektow na dožiwjenje kónčneho wužiwarja dla. Za dalšu pomoc hlejće https://xhr.spec.whatwg.org/#sync-warning