Why is this simple code giving an error? [duplicate]

Add HTML and missing day and append at the end before assignment

var d = new Date();
var day;
switch (d.getDay()) {
  case 0:
    day = "Sunday";
    break;
  case 1:
    day = "Monday";
    break;
  case 2:
    day = "Tuesday";
    break;
  case 3:
    day = "Wednesday";
    break;
  case 4:
    day = "Thursday";
    break;
  case 5:
    day = "Friday";
    break;
  default:
    day = "Saturday";
}

document.getElementById("demo").innerHTML = "Today is : " + day;
<div id="demo"></div>

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