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<html>3
<body>4
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<h2>JavaScript variables</h2>6
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<script>9
let username = "Ahmed"; 10
let username1 = "Mohamed"; 11
let username2 = "Aly"; 12
let _username = "Khaled"; 13
let user_name = "Sameh";14
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document.write("<b>"+ username +"<b><br>");16
document.write("<b>"+ username1 +"<b><br>");17
document.write("<b>"+ username2 +"<b><br>");18
document.write("<b>"+ _username +"<b><br>");19
document.write("<b>"+ user_name +"<b><br>");20
</script>21
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</body>23
</html>