This principle ensures that users can operate the interface.
If keyboard focus can be moved to a component of the page using a keyboard interface, then focus can be moved away from that component using only a keyboard interface.
All functionality of the content is operable through a keyboard interface without requiring specific timings for individual keystrokes.
If a keyboard shortcut is implemented in content using only letter (including upper- and lower-case letters), punctuation, number, or symbol characters, then at least one of the following is true: A mechanism is available to turn the shortcut off, a mechanism is available to remap the shortcut to use one or more non-printable keyboard characters (e.g., Ctrl, Alt), or the keyboard shortcut for a user interface component is only active when that component has focus.
For each time limit that is set by the content, the user is able to turn off, adjust, or extend the time limit.
For moving, blinking, scrolling, or auto-updating information, the user has the ability to pause, stop, or hide it.
Timing is not an essential part of the event or activity presented by the content, except for non-interactive synchronized media and real-time events.
Interruptions can be postponed or suppressed by the user, except interruptions involving an emergency.
When an authenticated session expires, the user can continue the activity without loss of data after re-authenticating.
Users are warned of the duration of any user inactivity that could cause data loss, unless the data is preserved for more than 20 hours of user inactivity.
Web pages do not contain anything that flashes more than three times in any one second period, or the flash is below the general flash and red flash thresholds.
Web pages do not contain anything that flashes more than three times in any one second period.
Motion animation triggered by interaction can be disabled, unless the animation is essential to the functionality or the information being conveyed.
A mechanism is available to bypass blocks of content that are repeated on multiple Web pages.
If a Web page can be navigated sequentially and the navigation sequences affect meaning or operation, focusable components receive focus in an order that preserves meaning and operability.
The purpose of each link can be determined from the link text alone or from the link text together with its programmatically determined link context.
More than one way is available to locate a Web page within a set of Web pages.
Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
Information about the user's location within a set of Web pages is available.
A mechanism is available to allow the purpose of each link to be identified from link text alone.
When a user interface component receives keyboard focus, the component is not entirely hidden due to author-created content.
When a user interface component receives keyboard focus, no part of the component is hidden by author-created content.
When the keyboard focus indicator is visible, an area of the focus indicator meets all the following:
All functionality that uses multipoint or path-based gestures for operation can be operated with a single pointer without a path-based gesture.
For functionality that can be operated using a single pointer, at least one of the following is true: No Down-Event, Abort or Undo, Up Reversal, or Essential.
For user interface components with labels that include text or images of text, the name contains the text that is presented visually.
Functionality that can be operated by device motion or user motion can also be operated by user interface components and responding to the motion can be disabled to prevent accidental actuation.
The size of the target for pointer inputs is at least 44 by 44 CSS pixels.
Web content does not restrict the use of input modalities available on a platform except where the restriction is essential, required to ensure the security of the content, or required to respect user settings.
All functionality that uses dragging movements for operation can be operated by a single pointer without dragging movements.
The size of the target for pointer inputs is at least 44 by 44 CSS pixels, except when: Equivalent, Inline, User Agent Control, or Essential.