<section class="without-transition">
  <h1>Without View Transition API 🥺</h1>
  <button>Add image</button>  
  <img src="https://source.unsplash.com/random/poland" alt="">
</section>

<section class="with-transition">
  <h1>With View Transition API 😍</h1>
  <button>Add image</button>
  <img src="https://source.unsplash.com/random/usa" alt="">  
</section>

body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 0;
  padding: 2vw;
  background: #110d14;
  user-select: none;
  font-family: system-ui;
  color: #fafafa;
}

@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;    
  }  
}

section {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(max(6vw, 100px), 1fr));
  grid-template-rows: min-content;
  grid-auto-rows: max(max(6vw, 100px), 100px);
  gap: max(10px, 1vw);
  margin: 0;
  padding: 2vw;
  background: #18141b;
  border-radius: 25px;
  box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
}

section > *:nth-child(5n+1):not(h1) {
  grid-column: span 2;
  grid-row: span 2;
}

h1 {
  grid-column: 1/-1;
  margin: 0;
  text-align: center;
  margin-bottom: 1rem;
  font-size: 20px;
  font-weight: normal;
}

button {
  background: #1f1b22;
  border: 0;
  color: inherit;
  font-size: 1rem;
  font-family: system-ui;
  cursor: pointer;
  border-radius: 10px;
}

img {
  width: 100%;
  height: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: 10px;  
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 1s;
}

const withTransitionButton = document.querySelector('.with-transition button');
const withoutTransitionButton = document.querySelector('.without-transition button');

withoutTransitionButton.addEventListener("click", () => {
  const newImage = document.createElement("img");
  newImage.src = "https://source.unsplash.com/random/poland";
  withoutTransitionButton.parentElement.appendChild(newImage);   
});

withTransitionButton.addEventListener("click", () => {
  const newImage = document.createElement("img");
  newImage.src = "https://source.unsplash.com/random/usa";
  document.startViewTransition(() => {    
    withTransitionButton.parentElement.appendChild(newImage);   
  });  
});