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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/HTMLOptionsCollection/selectedIndex below:

HTMLOptionsCollection: selectedIndex property - Web APIs

The selectedIndex property of the HTMLOptionsCollection interface is the numeric index of the first selected <option> element, if any, or −1 if no <option> is selected. Setting this property selects the option at that index and deselects all other options in this collection, while setting it to -1 deselects any currently selected elements. It is exactly equivalent to the selectedIndex property of the HTMLSelectElement that owns this collection.

A number.

const optionColl = document.getElementById("select").options;
console.log(`selected option: ${optionColl.selectedIndex}`); // the index of the first selected option, or -1 if no option is selected
optionColl.selectedIndex = 0; // selects the first item
optionColl.selectedIndex = -1; // deselects any selected option

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