8.27 WCAG 2.1 Success Criterion 2.5.1 – Pointer Gestures
Complex gestures, such as swiping, dragging a slider or two-finger pinching for zooming, can be performed through simpler actions like taps or long presses.
Before Rectification
The dragging of a slider requires a precise path of the user's pointer movement to control the volume.
After Rectification
Buttons are added as an alternative way for users to adjust the volume with simple clicks.
WCAG 2.1 Reference:
https://www.w3.org/WAI/WCAG21/Understanding/pointer-gestures.html