HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>role presentation</title>
</head>
<body>
  <img id="photo-1" src="https://via.placeholder.com/80" alt="Mountains at sunset">
  <img id="photo-2" src="https://via.placeholder.com/80">
  <pre id="out"></pre>
  <script>
    var images = document.querySelectorAll("img");
    images.forEach(function (image) {
      if (!image.alt) {
        image.role = "presentation";
      }
    });
    var lines = [];
    lines.push("photo-1: " + document.getElementById("photo-1").role);
    lines.push("photo-2: " + document.getElementById("photo-2").role);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.role — decorative images pattern (Try It)