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Operable Guidelines

Lesson 7 of Section 3

Enough Time

Provide users enough time to read and use content.

The basics of this guideline is to provide a static page to a user if required, where the user can control the information. If your web page doesn't have any moving, self adjusting, time sensitive, or "live" content, then it's a static page that already passes this guideline.

Timing Adjustable

For each time limit that is set by the content, at least one of the following is true:


  • Turn off: The user is allowed to turn off the time limit before encountering it
  • Adjust: The user is allowed to adjust the time limit before encountering it over a wide range that is at least ten times the length of the default setting
  • Extend: The user is warned before time expires and given at least 20 seconds to extend the time limit with a simple action (for example, "press the space bar"), and the user is allowed to extend the time limit at least ten times
  • Real-time Exception: The time limit is a required part of a real-time event (for example, an auction), and no alternative to the time limit is possible
  • Essential Exception: The time limit is essential and extending it would invalidate the activity
  • 20 Hour Exception: The time limit is longer than 20 hours.

If you are creating a web-based program with a time-limit, your knowledge should be adequate in conforming to this section. You should ensure that the method of achieving the above specifications is also accessible.

Pause, Stop, Hide

For moving, blinking, scrolling, or auto-updating information, all of the following are true:

  • Moving, blinking, scrolling: For any moving, blinking or scrolling information that (1) starts automatically, (2) lasts more than five seconds, and (3) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it unless the movement, blinking, or scrolling is part of an activity where it is essential; and
  • Auto-updating: For any auto-updating information that (1) starts automatically and (2) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it or to control the frequency of the update unless the auto-updating is part of an activity where it is essential.

Most web pages shouldn't concern this section. Otherwise if it applies to you, the methods above are very self explanatory.


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Sources

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