Description
In a multisite, you can create child sites. When you create a new child site, you fill in the title and the slug. And, you have to fill in your e-mail address, even if you are the network administrator.
If you enter an e-mail by hand, you may mistype. But, you can avoid such a risk. This code, shown below, automatically fill your e-mail address into the corresponding box, with an aid of jquery.