Nice article.

Some feedback would be to review the formatting of code blocks, since the indentations and syntaxes are sometimes incorrect.

For example, instead of:

function webConfirm() {
         var x;
         if (confirm("Do you want to exit?") == true) {
         x = "Welcome back!";
         } else {
         x = "Bye!";
         }
         document.getElementById("exit").innerHTML = x;
         }

It would be:

function webConfirm() {
    var x;
    if (confirm("Do you want to exit?") == true) {
        x = "Welcome back!";
    } else {
        x = "Bye!";
    }
    document.getElementById("exit").innerHTML = x;
}

Similarly, instead of:

If (message === true) {

It would be:

if (message === true) {