Comment Summary 2-5-2

From WCAG WG

2.5.2 Accidental Activation

SC Nov 5th Draft: For single-pointer activation, at least one of the following is true:

  • Activation is on the up-event, either explicitly or implicitly as a platform's generic activation/click event;
  • A mechanism is available that allows the user to choose the up-event as an option;
  • Confirmation is provided, which can dismiss activation;
  • Activation is reversible;
  • Down-event activation event is essential and waiting for the up-event would invalidate the activity.

New:

For single pointer activation a mechanism is available to use activation on the up-event, either explicitly or implicitly as a platform's generic activation event, unless one of the following is true:

  • The activation is confirmed;
  • The result of the activation is reversible;
  • Down-event activation is essential;

Definition of Single Pointer Activation:

Completion of an operation resulting from one point of contact with the screen

This is in contrast to multi-touch. A pointer can be any point of contact on the screen made by a mouse cursor, pen, touch (including multi-touch), or other pointing input device. This model makes it easier to write sites and applications that work well no matter what hardware the user has. For scenarios when device-specific handling is desired, the Pointer Events [pointerevents] specification also defines properties for inspecting.

New (11/27):

For single pointer activation implemented by the author, activation occurs on the up-event, either explicitly or implicitly as a platform's generic activation event, unless one of the following is true:

  • The result of the activation is reversible;
  • Down-event activation is essential;

Definition of Single Pointer Activation:

Completion of an operation resulting from one point of contact with the screen

This is in contrast to multi-touch. A pointer can be any point of contact on the screen made by a mouse cursor, pen, touch (including multi-touch), or other pointing input device. This model makes it easier to write sites and applications that work well no matter what hardware the user has. For scenarios when device-specific handling is desired, the Pointer Events [pointerevents] specification also defines properties for inspecting.

New (11/28)

For functionality which can be operated using a single pointer, at least one of the following is true:

  • No Down-Event: The down-event of the pointer is not used to execute any part of the function;
  • Abort or Undo: Completion of the function is on the up-event, and a mechanism is available to abort the function before completion or undo the function after completion;
  • Essential Completing the function on the down-event is essential.

Alternative to bullet #1 No Down-Event: The down-event of the pointer does not trigger effects that last past the up-event (to handle the cases where useful information appears on click and disappears on release.)

Also need to update definition for Single Pointer Activation to "Single Pointer" (in 3.2.6 also):

one point of contact with the screen

This is in contrast to multi-touch. A pointer can be any point of contact on the screen made by a mouse cursor, pen, touch (including multi-touch), or other pointing input device. This model makes it easier to write sites and applications that work well no matter what hardware the user has. For scenarios when device-specific handling is desired, the Pointer Events [pointerevents] specification also defines properties for inspecting.

Issues

Issue 561: Thank you for the comment. Due to the increase diversity of input events we feel that it is best to not limit reversibility to up-event initiated actions.

Issue 380: Response Drag and Drop handle in Understanding document, series of concurrent actions (drag and drop, double-click, etc), covered by SC 2.5.1. Drag and drop is not a single point activation.

Issue 364: Response..we made a revision that we think addresses your concern, please review.

Issue 330: Response..Add a reference to Pointer Event Spec and - event fired when the trigger stimulous id relaesed for more information see the Pointer Event Spec for pointer up event, (https://www.w3.org/TR/pointerevents/#the-pointerup-event). Add single pointer activation definition change. @activation resulting from@ one point of contact with the screen. Exclude drag and drop?


GitHub open issues link

http://github.com/w3c/wcag21/labels/~comment-accidental-activation

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