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https://www.w3schools.com/js/tryit.asp?filename=tryjs_syntax_case <!DOCTYPE html> <html> <body> <h2>JavaScript is Case Sensitive</h2> <p>Try change lastName to lastname.</p> <p id="demo"></p> <script> var lastname, lastName; lastName = "Doe"; lastname = "Peterson"; document.getElementById("demo").innerHTML = lastName; </script> </body> </html> |