Hi Michael20,
You can select an item in several ways:

• If you are initializing items declaratively inside your web page, you can set the selected attribute to the desired List Item element.
• By setting the selectedIndexes or selectedValues properties to the correposnding value.
• By calling the select method. This method accepts one argument – a List Item element instnace. You can get a reference to it by calling the getter items on the Combo Box element and filter out the item you desire.

Best Regards,
Christopher
Smart HTML Elements Team
https://www.htmlelements.com