For keyboard-only users, it's hard to use the "sort" dropdown because each time you press the down arrow, the new option is immediately submitted.
The preferred behavior is that when down arrow is pressed, the popup opens, and focus is placed on the first selectable option, but the value is not actually updated yet -- that only happens on pressing "enter," "spacebar," or tab.
For keyboard-only users, it's hard to use the "sort" dropdown because each time you press the down arrow, the new option is immediately submitted.
The preferred behavior is that when down arrow is pressed, the popup opens, and focus is placed on the first selectable option, but the value is not actually updated yet -- that only happens on pressing "enter," "spacebar," or tab.
https://www.w3.org/TR/wai-aria-practices/examples/combobox/combobox-select-only.html#kbd_label_listbox