html - inject javascript to iframe before rendering -


i'm using prototype of "appendchild" intercept calls "appendchild" , inject javascript "" of iframe, when error because when try inject code iframe still not ready i'm getting empty iframe null in contentdocument.

my code:

window.callbackfunc = function(elem, args) {      (var key in elem) {          if(elem.hasownproperty(key) && elem[key].id && elem[key].id.includes('testframe'))         {             console.log("start");             console.log(elem);           }      }   } window.f = element.prototype.appendchild;  element.prototype.appendchild = function() {     window.callbackfunc.call(this, arguments);     return window.f.apply(this, arguments); };

the output in console iframe object empty.

can add javascript head of iframe before ready? in exact point print in code?


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