50 lines
2.3 KiB
Markdown
50 lines
2.3 KiB
Markdown
[Back to 3 Understandable index](index.md)
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# 3.2.5 Change on Request
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- Level: AAA
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- Guideline: 3.2 Predictable
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- Principle: 3 Understandable
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## What it is
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Changes of context are initiated only by user request or a mechanism is available to turn off such changes.
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## How to test
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- Check: Changes of context are initiated only by user request or a mechanism is available to turn off such changes.
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- Use the sufficient techniques below as acceptable methods when applicable.
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- Confirm none of the common failures apply.
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## Sufficient techniques (W3C)
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- G76: Providing a mechanism to request an update of the content instead of updating automatically
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- SVR1: Implementing automatic redirects on the server side instead of on the client side
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- G110: Using an instant client-side redirect
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- H76: Using meta refresh to create an instant client-side redirect
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- H83: Using the target attribute to open a new window on user request and indicating this in link text
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- SCR24: Using progressive enhancement to open new windows on user request
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- SCR19: Using an onchange event on a select element without causing a change of context
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## Advisory techniques (W3C)
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- G200: Opening new windows and tabs from a link only when necessary
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## Common failures (W3C)
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- F60: Failure of Success Criterion 3.2.5 due to launching a new window when a user enters text into an input field
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- F61: Failure of Success Criterion 3.2.5 due to complete change of main content through an automatic update that the user cannot disable from within the content
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- F9: Failure of Success Criterion 3.2.5 due to changing the context when the user removes focus from a form element
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- F22: Failure of Success Criterion 3.2.5 due to opening windows that are not requested by the user
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- F52: Failure of Success Criterion 3.2.5 due to opening a new window as soon as a new page is loaded
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- F40: Failure due to using meta redirect with a time limit
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- F41: Failure of Success Criterion 2.2.1, 2.2.4, and 3.2.5 due to using meta refresh to reload the page
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## Resources
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- WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#change-on-request
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- Understanding: https://www.w3.org/WAI/WCAG22/Understanding/change-on-request.html
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- Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#change-on-request
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[Back to 3 Understandable index](index.md)
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