The scroll-timeline-axis CSS property is used to specify the scrollbar direction that will be used to provide the timeline for a named scroll progress timeline animation, which is progressed through by scrolling a scrollable element (scroller) between top and bottom (or left and right). scroll-timeline is set on the scroller that will provide the timeline. See CSS scroll-driven animations for more details....Syntax css /* Logical property values */ scroll-timeline-axis: block;...inline; /* Non-logical property values */ scroll-timeline-axis: y;...