The SelectElement type exposes the following members.
Clear all selected entries. This is only valid when the SELECT supports multiple selections.
Deselect the option by the index, as determined by the "index" attribute of the element.
Deselect the option by the text displayed.
Deselect the option having value matching the specified text.
Select the option by the index, as determined by the "index" attribute of the element.
Select all options by the text displayed.
Select an option by the value.