For moving, blinking, scrolling, or auto-updating information, all of the following are true:
Moving, blinking, scrolling: For any moving, blinking or scrolling information that (1) starts automatically, (2) lasts more than five seconds, and (3) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it unless the movement, blinking, or scrolling is part of an activity where it is essential; and
Auto-updating: For any auto-updating information that (1) starts automatically and (2) is presented in parallel with other content, there is a mechanism for the user to pause, stop, or hide it or to control the frequency of the update unless the auto-updating is part of an activity where it is essential.
*For requirements related to flickering or flashing content, refer to Guideline 2.3.
*Since any content that does not meet this success criterion can interfere with a user’s ability to use the whole page, all content on the Web page (whether it is used to meet other success criteria or not) must meet this success criterion. See Conformance Requirement 5: Non-Interference.
*Content that is updated periodically by software or that is streamed to the user agent is not required to preserve or present information that is generated or received between the initiation of the pause and resuming presentation, as this may not be technically possible, and in many situations could be misleading to do so.
*An animation that occurs as part of a preload phase or similar situation can be considered essential if interaction cannot occur during that phase for all users and if not indicating progress could confuse users or cause them to think that content was frozen or broken.
Questions & Answers
Would using morph features in PowerPoint fall under success criterion 2.2.2 (or any others)? I use morph a lot in presentations and recently heard someone say "Does anyone else feel like they're on a boat?" when I was using morph to re-sort a list of...
- Three Flash
I'm working on integrating video into a homepage. I am mainly wondering about video accessibility constraints. Ideally I want the video to autoplay when the page loads and loop when the video ends. A play/pause button will be overlayed on top of the video. Wondering...
Our director wants to have an eagle (our logo) fly across the page on our web site. This is a terrible idea but I'd like to know what WCAG 2.0, section 508, and/or usability principles this violates. Any other arguments against this will also be...
- alt tags
Are there any guidelines or best practices about using a video loop as the background images for banner areas? Should there be a control for the user to stop the video?
If I have a gif on a site that loops continuously. Is that okay or does it violated the 'can't have repeating flashing stuff' rule?
I see a lot of WordPress websites (and websites in generally really) using sliders for images and information. I can see how it would be really easy to make an accessible slider. Are there any 'out of the box' accessible WordPress sliders?
- third party