An HTML Select list is a form control used to create a drop-down list of items from which
the user can select. Each item in a select list is defined by an option element. The most
basic code for an HTML select list is shown below.
The multiple attribute allows the user to select multiple items in the list.
Note: the user must press and hold the [Ctrl] key while selecting multiple items.
When the user selects one of the items in a select list, an onchange
event is triggered. The selectedIndex property will then contain the
index of the item that the user selected. Select list option indexes start with
0 for the first item.