img onerror

• live tag

Array.from(document.getElementsByTagName('img')).map(el=>{
 el.onerror=function(e){
   this.src='data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='
 }
})

• create in

function x(){
 let el=document.createElement('img');
 el.src="x";
 el.onerror=function(e){
  this.src='data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='
 }
 document.body.appendChild(el)
}

• direct

<img src="a" onerror="this.src='data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='" />
<img src="a" />
<button onclick="x()">x</button>
<hr>
<img id="b" />