Success Criterion 2.5.1 Pointer Gestures *

Understanding Success Criterion: 

All functionality that uses multipoint or path-based gestures for operation can be operated with a single pointer without a path-based gesture, unless a multipoint or path-based gesture is essential.
This requirement applies to web content that interprets pointer actions (i.e. this does not apply to actions that are required to operate the user agent or assistive technology).

Accessibility Level: 
Intent of Success Criterion: 

The intent of this Success Criterion is to ensure that content can be operated using simple inputs on a wide range of pointing devices. This is important for users who cannot perform complex gestures, such as multi-point or path-based gestures, in a precise manner, either because they may lack the accuracy necessary to carry them out or because they use a pointing method that lacks the capability or accuracy.
A path-based gesture involves a user interaction where the gesture's success is dependent on the path of the user's pointer movement and not just the endpoints. Examples include swiping (which relies on the direction of movement) the dragging of a slider thumb, or gestures which trace a prescribed path, as in the drawing of a specific shape. Such paths may be drawn with a finger or stylus on a touchscreen, on a graphics tablet or trackpad, or with a mouse, joystick, or similar pointer device.
A user may find it difficult or impossible to accomplish these if they have impaired fine motor control, or if they use a specialized or adapted input device such as a head pointer, eye-gaze system, or speech-controlled mouse emulation.

Specific Benefits of Success Criterion: 

• Users who cannot (accurately) perform complex pointer gestures will have alternative means for operating the content.
• The availability of user interface elements provided as a fallback for complex gestures helps users who may often be unaware of the support for complex pointer gestures. This can be beneficial especially for users with cognitive or learning disabilities.