This principle ensures that users can understand the information as well as the operation of the user interface.
The default human language of each web page can be programmatically determined.
The human language of each passage or phrase in the content can be programmatically determined.
A mechanism is available for identifying specific definitions of words or phrases used in an unusual or restricted way, including idioms and jargon.
A mechanism for identifying the expanded form or meaning of abbreviations is available.
When text requires reading ability more advanced than the lower secondary education level after removal of proper names and titles, supplemental content, or a version that does not require reading ability more advanced than the lower secondary education level, is available.
A mechanism is available for identifying specific pronunciation of words where meaning of the words, in context, is ambiguous without knowing the pronunciation.
When any user interface component receives focus, it does not initiate a change of context.
Changing the setting of any user interface component does not automatically cause a change of context unless the user has been advised of the behavior before using the component.
Navigational mechanisms that are repeated on multiple Web pages within a set of Web pages occur in the same relative order each time they are repeated, unless a change is initiated by the user.
Components that have the same functionality within a set of Web pages are identified consistently.
Changes of context are initiated only by user request or a mechanism is available to turn off such changes.
If an input error is automatically detected, the item that is in error is identified and the error is described to the user in text.
Labels or instructions are provided when content requires user input.
If an input error is automatically detected and suggestions for correction are known, then the suggestions are provided to the user, unless it would jeopardize the security or purpose of the content.
For web pages that require the user to submit information, at least one of the following is true: Reversible, Checked, or Confirmed.
For web pages that require the user to submit information, at least one of the following is true: Reversible, Checked, or Confirmed.