In this lesson
- first
Principle 3 - Is the website understandable to human beings
Guideline 3.1 Make text content readable and understandable.
3.1.1 The default human language of each Web page can be programmatically determined. (Level A)
- Define the default language of each web page (Lesson 2 section 2)
3.1.2 The human language of each passage or phrase in the content can be programmatically determined except for proper names, technical terms, words of indeterminate language, and words or phrases that have become part of the vernacular of the immediately surrounding text. (Level AA)
- State if you use a different language within a page (Lesson 2 section 2)
3.1.3 A mechanism is available for identifying specific definitions of words or phrases used in an unusual or restricted way, including idioms and jargon. (Level AAA)
- Use the <abbr> and <acronym> elements (Lesson 2 section 2)
3.1.4 A mechanism for identifying the expanded form or meaning of abbreviations is available. (Level AAA)
- Use the <abbr> and <acronym> elements (Lesson 2 section 2)
3.1.5 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. (Level AAA)
- Use appropriate language for your target audience (Lesson 2 section 1)
3.1.6 A mechanism is available for identifying specific pronunciation of words where meaning of the words, in context, is ambiguous without knowing the pronunciation. (Level AAA)
Guideline 3.2 Make Web pages appear and operate in predictable ways.
3.2.1 When any component receives focus, it does not initiate a change of context. (Level A)
- Do not change the size of a roll-over button or screen component (Lesson 10 section 2)
3.2.2 Changing the setting of any user interface component does not automatically cause a change of context unless the user has been advised of the behaviour before using the component. (Level A)
- Do not change the size of a roll-over button or screen component (Lesson 10 section 2)
3.2.3 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. (Level AA)
- Use a consitent navigation structure across all pages (Lesson 10 section 2)
3.2.4 Components that have the same functionality within a set of Web pages are identified consistently. (Level AA)
- Use a consitent navigation structure across all pages (Lesson 10 section 2)
3.2.5 Changes of context are initiated only by user request or a mechanism is available to turn off such changes. (Level AAA)
Guideline 3.3 Help users avoid and correct mistakes.
The following issues are addressed in Lesson 9 - Forms
3.3.1 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. (Level A)
3.3.2 Labels or instructions are provided when content requires user input. (Level A)
3.3.3 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. (Level AA)
3.3.4 For Web pages that cause legal commitments or financial transactions for the user to occur, that modify or delete user-controllable data in data storage systems, or that submit user test responses, at least one of the following is true: (Level AA)
3.3.5 Context-sensitive help is available. (Level AAA)
3.3.6 For Web pages that require the user to submit information, at least one of the following is true: (Level AAA)
- Reversible: Submissions are reversible.
- Checked: Data entered by the user is checked for input errors and the user is provided an opportunity to correct them.
- Confirmed: A mechanism is available for reviewing, confirming, and correcting information before finalizing the submission.