HTML
The blink element, while not part of the official HTML specification, is supported by many user agents. It causes any text inside the element to blink at a predetermined rate. This cannot be interrupted by the user, nor can it be disabled as a preference. The blinking continues as long as the page is displayed. Therefore, content that uses blink fails the Success Criterion because blinking can continue for more than three seconds.
A product list page uses the blink element to draw attention to sale prices. This fails the Success Criterion because users cannot control the blink.
<p>My Great Product <blink>Sale! $44,995!</blink></p>