Techniques for WCAG 2.0

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G164: Providing a stated time within which an online request (or transaction) may be amended or canceled by the user after making the request


All technologies that provide forms.

This technique relates to:


The objective of this technique is to allow users to recover from errors made when placing an order by providing them with a period of time during which they can cancel or change the order. In general, a contract or an order is a legal commitment and cannot be canceled. However, a Web site may choose to offer this capability, and it provides a way for users to recover from errors.

The Web content would need to tell the user how long the cancellation period is after submitting the form and what the procedure would be to cancel the order. The cancellation procedure may not be possible online. It may, for instance, require written notice be sent to an address listed on the Web page.

After submitting the form, the user is informed of the length of the cancellation period and the procedure for canceling the transaction. It's best to provide the cancellation procedure at the same website where the transaction was submitted so that it is as easy to cancel as it was to submit and to accommodate users who may be unable to use other mechanisms. But, if necessary, the cancellation procedure may be provided through some other mechanism or combination of mechanisms as long as it has equivalent cross-disability accessibility. In this case, users are warned prior to submitting the form that they will not be able to cancel their order online.


Example 1: Online shopping

An online shopping Web site lets users cancel purchases up to 24 hours after they have been made. The Web site explains their policy, and includes a summary of the policy on the purchase receipt emailed to the user. After 24 hours, the purchase will be shipped to the user and can no longer be canceled.

Example 2: Custom orders

A Web site sells custom sports jackets that are made to order. The customer chooses the fabric and provides body measurements for the tailor. The Web site gives customers up to three days to change or cancel an order. Once the material has been cut to the customer's specifications, it is no longer possible to change or cancel the order. The company policy is described on its Web site.



  1. Check that the Web page describes the time period to cancel or change an order.

  2. Check that the Web page describes the process for canceling or changing an order.

Expected Results

If this is a sufficient technique for a success criterion, failing this test procedure does not necessarily mean that the success criterion has not been satisfied in some other way, only that this technique has not been successfully implemented and can not be used to claim conformance.

Techniques are Informative

Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.0 is the success criteria from the WCAG 2.0 standard—not the techniques. For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.0.