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<!DOCTYPE html> <html> <body> <h1>JavaScript Errors</h1> <h2>The ReferenceError</h2> <p>You cannot use the value of a non-existing variable:</p> <p id="demo"></p> <script> let x = 5; try { x = y + 1; } catch(err) { document.getElementById("demo").innerHTML = err.name; } </script> </body> </html>
