Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function showDetails(animal) { var animalType = animal.getAttribute("data-animal-type"); alert("The " + animal.innerHTML + " is a " + animalType + "."); } </script> </head> <body> <h1>Species</h1> <p>Click on a specie to see what type it is:</p> <ul> <li onclick="showDetails(this)" id="owl" data-animal-type="bird">Owl</li> <li onclick="showDetails(this)" id="salmon" data-animal-type="fish">Salmon</li> <li onclick="showDetails(this)" id="tarantula" data-animal-type="spider">Tarantula</li> </ul> </body> </html>
Result:
W3Schools.com - Try it yourself