2.2 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 Reference:
https://www.w3.org/WAI/WCAG21/Understanding/pointer-gestures.html