49 lines
2.2 KiB
Markdown
49 lines
2.2 KiB
Markdown
[Back to 2 Operable index](index.html)
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# 2.5.2 Pointer Cancellation
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- Level: A
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- Guideline: 2.5 Input Modalities
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- Principle: 2 Operable
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## What it is
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For functionality that can be operated using a single pointer, at least one of the following is true:
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- **No Down-Event:** The down-event of the pointer is not used to execute any part of the function;
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- **Abort or Undo:** Completion of the function is on the up-event, and a mechanism is available to abort the function before completion or to undo the function after completion;
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- **Up Reversal:** The up-event reverses any outcome of the preceding down-event;
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- **Essential:** Completing the function on the down-event is essential.
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## How to test
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- Check: The down-event of the pointer is not used to execute any part of the function;
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- Check: Completion of the function is on the up-event, and a mechanism is available to abort the function before completion or to undo the function after completion;
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- Check: The up-event reverses any outcome of the preceding down-event;
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- Check: Completing the function on the down-event is essential.
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- Use the sufficient techniques below as acceptable methods when applicable.
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- Confirm none of the common failures apply.
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## Sufficient techniques (W3C)
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- G210: Ensuring that drag-and-drop actions can be cancelled
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- G212: Using native controls to ensure functionality is triggered on the up-event.
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- Touch events are only triggered when touch is removed from a control (Potential future technique)
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## Common failures (W3C)
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- F101: Failure of Success Criterion 2.5.2 due to activating a control on the down-event
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## Notes
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- Note 1: Functions that emulate a keyboard or numeric keypad key press are considered essential.
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- Note 2: 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).
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## Resources
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- WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#pointer-cancellation
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- Understanding: https://www.w3.org/WAI/WCAG22/Understanding/pointer-cancellation.html
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- Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#pointer-cancellation
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[Back to 2 Operable index](index.html)
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