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Jul 25th, 2018
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  1. let iframe = document.querySelector(".gameframe");  // ramka iframe
  2. let content = iframe.contentDocument || iframe.contentWindow.document;  // dokument z iframe'a
  3.  
  4. let mainDiv = content.querySelector("body > div"); // div w którym chcę nasłuchiwać zmian o bezpośrednim potomku
  5. let observer = new MutationObserver(mutations => {
  6.   for (let mutation of mutations) {
  7.     console.log("mutation", mutation);
  8.   }
  9. });
  10.  
  11. observer.observe(mainDiv, {
  12.   attributes: true,
  13.   attributeOldValue: true,
  14.   childList: true,
  15.   characterData: true,
  16. });
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