<img class="img" src="https://i.imgur.com/eTxzk46.jpeg">
  <img class="img" src="https://i.imgur.com/eTxzk46.jpeg">
  <img class="img" src="https://i.imgur.com/eTxzk46.jpeg">
  <img class="img" src="https://i.imgur.com/eTxzk46.jpeg">

  <img class="img" src="https://i.imgur.com/Txzk46.jpeg" >
.img{
  width: 200px;
  height: 200px;
}
const img = document.querySelectorAll('.img');
const defaultImg = 'https://i.imgur.com/4aYifFs.jpeg';

img.forEach((item,index) => {
  const image = new Image();
  image.src = item.src
  console.log(image.complete)
  if (!image.complete) {
    item.src = defaultImg;
  }
});

External CSS

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External JavaScript

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