For each web page, can the content be presented without any loss of information or functionality and without having to scroll vertically for a window with a height of 256 px or horizontally for a window with a width of 320 px (excluding special cases)?

WCAG Reference

10.11.1

For each web page, when the content with a horizontal reading direction is displayed in a window reduced to a width of 320 px, is all the information and functions available without any horizontal scrolling (excluding special cases)?
10.11.2

For each web page, when content with a vertical reading direction is displayed in a window reduced to a height of 256 px, is all the information and functions available without any vertical scrolling (excluding special cases)?