Understanding WCAG2.0

Implementation that interrupts the operation of the user should be avoided, but this is not the case for interruptions requiring emergency. For example, an interruption that encourages extension when operation time limit is approaching is considered indispensable. It will also include emergency alerts for citizens.

Allow the user to adjust the behavior related to interrupt processing with the user setting of the site. For example, hide anything other than urgent alerts such as 2.2.4b.

Principle Operable User interface components and navigation must be operable.
Guideline Enough Time Provide users enough time to read and use content.
Criterion Interruptions
(2.2.4 AAA)
Interruption can be postponed or suppressed by the user. However, interrupts requiring urgency are excluded.

URL of Techniques for WCAG 2.0