Tab.html

<!-- The grid: four columns -->
<div class="row">
  <div class="column">
    <img src="https://cdn.pixabay.com/photo/2016/03/05/23/02/barbecue-1239434__480.jpg" alt="Nature" content="testing" onclick="myFunction(this);">
  </div>
  <div class="column">
    <img src="https://cdn.pixabay.com/photo/2014/12/21/23/40/steak-575806__480.png" alt="Snow" content="testing" onclick="myFunction(this);">
  </div>
  <div class="column">
    <img src="https://cdn.pixabay.com/photo/2020/02/02/15/07/meat-4813261__480.jpg" alt="Mountains" content="testing" onclick="myFunction(this);">
  </div>
  <div class="column">
    <img src="https://cdn.pixabay.com/photo/2016/03/17/23/26/italy-1264104__480.jpg" alt="Lights" content="testing" onclick="myFunction(this);">
  </div>
</div>
<style>
/* The grid: Four equal columns that floats next to each other */
.column {
  float: left;
  width: 25%;
  padding: 10px;
}

/* Style the images inside the grid */
.column img {
  opacity: 0.8;
  cursor: pointer;
}

.column img:hover {
  opacity: 1;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* The expanding image container (positioning is needed to position the close button and the text) */
.container {
  position: relative;
  display: none;
}

/* Expanding image text */
#imgtext {
  position: absolute;
  bottom: 15px;
  left: 15px;
  color: white;
  font-size: 20px;
}

/* Closable button inside the image */
.closebtn {
  position: absolute;
  top: 10px;
  right: 15px;
  color: white;
  font-size: 35px;
  cursor: pointer;
}
</style>
<script>
function myFunction(imgs) {
  // Get the expanded image
  var expandImg = document.getElementById("expandedImg");
  // Get the image text
  var imgText = document.getElementById("imgtext");
  // Use the same src in the expanded image as the image being clicked on from the grid
  expandImg.src = imgs.src;
  // Use the value of the alt attribute of the clickable image as text inside the expanded image
  imgText.innerHTML = imgs.alt;
  // Show the container element (hidden with CSS)
  expandImg.parentElement.style.display = "block";
}
</script>