Scrollable Listbox Example: List entries are not displayed in the visible area

[JAWS-test]

https://www.w3.org/WAI/ARIA/apg/example-index/listbox/listbox-scrollable.html, https://www.w3.org/WAI/ARIA/apg/example-index/listbox/listbox-grouped.html

• Firefox: When the listbox receives keyboard focus, it is not scrolled into the visible area. When navigating through the options, the listbox is also not scrolled into the visible area, so that depending on the position of the listbox, it is not visible during keyboard operation which option was selected
• Chrome: When the listbox receives keyboard focus, it scrolls into the visible area, but when navigating through the options, scrolling of the entire page occurs at the beginning of the listbox (pressing key up), so that the listbox can be completely outside the visible area. If you then continue to navigate through the options using the arrow keys (key down), the listbox is not scrolled back and thus the listbox and selected options are not visually noticeable.
• Edge: When the listbox receives keyboard focus, it scrolls into the visible area, but when navigating through the options, scrolling of the entire page occurs at the beginning and end of the listbox (pressing key up or down), so that the listbox can be completely outside the visible area. If you then continue to navigate through the options using the arrow keys (key down or up), the listbox is not scrolled back and thus the listbox and selected options are not visually noticeable.

https://www.w3.org/WAI/ARIA/apg/example-index/listbox/listbox-rearrangeable.html

• Firefox, Chrome and Edge: When the listbox receives keyboard focus, it scrolls into the visible area, but when navigating through the options, scrolling of the entire page occurs at the beginning and end of the listbox (pressing key up or down), so that the listbox can be completely outside the visible area. If you then continue to navigate through the options using the arrow keys (key down or up), the listbox is not scrolled back and thus the listbox and selected options are not visually noticeable.