diff --git a/packages/ncids-js/src/components/usa-combo-box/__tests__/combo-box.events.test.ts b/packages/ncids-js/src/components/usa-combo-box/__tests__/combo-box.events.test.ts
index d04f40fd8..437dfffc9 100644
--- a/packages/ncids-js/src/components/usa-combo-box/__tests__/combo-box.events.test.ts
+++ b/packages/ncids-js/src/components/usa-combo-box/__tests__/combo-box.events.test.ts
@@ -499,13 +499,13 @@ describe('Combo box - Events', () => {
 			inputValue: 'a',
 		});
 
-		const previouslySelected1 = Object.assign({}, selected);
+		const previouslySelected1 = Object.assign({}, Array.from(selected));
 		await user.keyboard('[Enter]');
 		expect(selectedEvent).toHaveBeenCalledTimes(1);
 		expect(selectedEvent.mock.calls[0][0].detail).toEqual({
 			comboBox: comboBoxEl,
 			inputValue: 'Apple',
-			selected: selected,
+			selected: Array.from(selected),
 			previouslySelected: previouslySelected1,
 		});
 		expect(listboxCollapsedEvent).toHaveBeenCalledTimes(1);
@@ -514,7 +514,7 @@ describe('Combo box - Events', () => {
 			inputValue: 'Apple',
 		});
 
-		const previouslySelected2 = Object.assign({}, selected);
+		const previouslySelected2 = Object.assign({}, Array.from(selected));
 		await user.keyboard('[Escape]');
 		expect(unselectedEvent).toHaveBeenCalledTimes(1);
 		expect(unselectedEvent.mock.calls[0][0].detail).toEqual({
@@ -534,7 +534,7 @@ describe('Combo box - Events', () => {
 		expect(textClearedEvent.mock.calls[0][0].detail).toEqual({
 			comboBox: comboBoxEl,
 			previousInputValue: 'aa',
-			selected: selected,
+			selected: Array.from(selected),
 		});
 	});
 
diff --git a/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.selected.event-details.ts b/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.selected.event-details.ts
index e4c129927..a7b2b92df 100644
--- a/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.selected.event-details.ts
+++ b/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.selected.event-details.ts
@@ -4,10 +4,10 @@ import { ComboBoxEventDetails } from './combo-box.event-details';
  * Custom event details for the `combo-box:selected` event.
  */
 export type ComboBoxSelectedEventDetails = ComboBoxEventDetails & {
-	/** An [HTML collection of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) via the combo box select element. */
-	selected: HTMLCollectionOf<HTMLOptionElement>;
+	/** An [Array of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) via the combo box select element. */
+	selected: Array<HTMLOptionElement>;
 	/** The current value of the combo box input. */
 	inputValue: string;
-	/** An [HTML collection of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) before a change was made. */
-	previouslySelected: HTMLCollectionOf<HTMLOptionElement>;
+	/** An [Array of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) before a change was made. */
+	previouslySelected: Array<HTMLOptionElement>;
 };
diff --git a/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.unselected.event-details.ts b/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.unselected.event-details.ts
index 3c46d80b7..86bba46bc 100644
--- a/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.unselected.event-details.ts
+++ b/packages/ncids-js/src/components/usa-combo-box/event-details/combo-box.unselected.event-details.ts
@@ -4,6 +4,6 @@ import { ComboBoxEventDetails } from './combo-box.event-details';
  * Custom event details for the `combo-box:unselected` event.
  */
 export type ComboBoxUnselectedEventDetails = ComboBoxEventDetails & {
-	/** An [HTML collection of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) before a change was made. */
-	previouslySelected: HTMLCollectionOf<HTMLOptionElement>;
+	/** An [Array of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions) before a change was made. */
+	previouslySelected: Array<HTMLOptionElement>;
 };
diff --git a/packages/ncids-js/src/components/usa-combo-box/event-details/input.text-cleared.event-details.ts b/packages/ncids-js/src/components/usa-combo-box/event-details/input.text-cleared.event-details.ts
index 0cce0e187..9c10b5f36 100644
--- a/packages/ncids-js/src/components/usa-combo-box/event-details/input.text-cleared.event-details.ts
+++ b/packages/ncids-js/src/components/usa-combo-box/event-details/input.text-cleared.event-details.ts
@@ -6,11 +6,11 @@ import { ComboBoxEventDetails } from './combo-box.event-details';
 export type ComboBoxTextClearedEventDetails = ComboBoxEventDetails & {
 	/**
 	 * An
-	 * [HTML collection of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions)
+	 * [Array of selected options](https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions)
 	 * via the combo box select element. May be empty if no value was selected
 	 * before the text was cleared.
 	 */
-	selected: HTMLCollectionOf<HTMLOptionElement>;
+	selected: Array<HTMLOptionElement>;
 	/** The previous value of the combo box input before the text was cleared. */
 	previousInputValue: string;
 };
diff --git a/packages/ncids-js/src/components/usa-combo-box/usa-combo-box.component.ts b/packages/ncids-js/src/components/usa-combo-box/usa-combo-box.component.ts
index c7738b0a4..a60324273 100644
--- a/packages/ncids-js/src/components/usa-combo-box/usa-combo-box.component.ts
+++ b/packages/ncids-js/src/components/usa-combo-box/usa-combo-box.component.ts
@@ -309,23 +309,23 @@ export class USAComboBox {
 	}
 
 	/**
-	 * An HTMLCollection representing the set of <option> elements that are
+	 * An Array representing the set of <option> elements that are
 	 * selected.
 	 *
 	 * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedOptions
 	 */
-	public getSelectedOptions(): HTMLCollectionOf<HTMLOptionElement> {
-		return this.select.selectedOptions;
+	public getSelectedOptions(): Array<HTMLOptionElement> {
+		return Array.from(this.select.selectedOptions);
 	}
 
 	/**
-	 * An HTMLOptionsCollection representing the set of <option> elements
+	 * An Array representing the set of <option> elements
 	 * contained by this element.
 	 *
 	 * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/options
 	 */
-	public getOptions(): HTMLCollectionOf<HTMLOptionElement> {
-		return this.select.options;
+	public getOptions(): Array<HTMLOptionElement> {
+		return Array.from(this.select.options);
 	}
 
 	/**
@@ -1115,7 +1115,7 @@ export class USAComboBox {
 				bubbles: true,
 				detail: <ComboBoxTextClearedEventDetails>{
 					comboBox: this.comboBox,
-					selected: this.select.selectedOptions,
+					selected: this.getSelectedOptions(),
 					previousInputValue: previousInputValue,
 				},
 			})
@@ -1130,7 +1130,7 @@ export class USAComboBox {
 	 */
 	private setComboBox(listItem: HTMLLIElement): void {
 		// Clone of the previously selected options for the dispatched event.
-		const previouslySelected = Object.assign({}, this.select.selectedOptions);
+		const previouslySelected = Object.assign({}, this.getSelectedOptions());
 
 		this.selectedOption = listItem;
 		const value = listItem.dataset.value as string;
@@ -1154,7 +1154,7 @@ export class USAComboBox {
 					detail: <ComboBoxSelectedEventDetails>{
 						comboBox: this.comboBox,
 						previouslySelected: previouslySelected,
-						selected: this.select.selectedOptions,
+						selected: this.getSelectedOptions(),
 						inputValue: text,
 					},
 				})
@@ -1168,7 +1168,7 @@ export class USAComboBox {
 	 */
 	private unsetComboBox(): void {
 		// Clone of the previously selected options for the dispatched event.
-		const previouslySelected = Object.assign({}, this.select.selectedOptions);
+		const previouslySelected = Object.assign({}, this.getSelectedOptions());
 
 		this.resetComboBox();