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Execute a script when an error occurs in HTML?

The onerror event triggers when an error occurs in HTML. You can try to run the following code to implement onerror event attribute −

Example

<!DOCTYPE html>
<html>
   <body>

      <img src = "new.png" onerror = "display()">
      <p>Alert would be visible, if the image isn't loaded correctly.</p>

      <script>
         function display() {
            alert("Image load unsuccessful.");
         }
      </script>
   </body>
   
</html>