Update src/combobox/combobox.component.ts

Co-Authored-By: cal-smith <[email protected]>

Author: zvonimirfras

src/combobox/combobox.component.ts

@@ -291,7 +291,7 @@ export class ComboBox implements OnChanges, OnInit, AfterViewInit, AfterContentI
 			ev.stopPropagation();
 			this.openDropdown();
 			setTimeout(() => this.view.getCurrentElement().focus(), 0);
-		} else if (ev.key === "ArrowUp"
+		} else if ((ev.key === "ArrowUp" || ev.key === "Up") // `"Up"` is IE specific value
 			&& this.dropdownMenu.nativeElement.contains(ev.target)
 			&& !this.view["hasPrevElement"]()) {
 			this.elementRef.nativeElement.querySelector(".bx--text-input").focus();