PEAT doesn’t use much RAM, but the computer needs to have enough memory so that the operating system and the browser can run efficiently. Intel Core 2 Duo or Intel Core 2 Quad) running at a minimum of 2.0GHz, with at least a low end dedicated graphics card or a relatively “fast” (circa 2009) integrated graphics solution. Computer with a multi-core processor (e.g.To run PEAT (including PEAT’s capture tool) these are the minimum requirements: Additional details about the WCAG 2.0 requirements including definitions for the general and red flash thresholds can be found in Understanding Success Criterion 2.3.1 of Understanding WCAG 2.0. PEAT is capable of detecting general flash failures, red flash failures, and extended flash warnings. The combined area of flashes occurring concurrently occupies no more than a total of one quarter of any 341 x 256 pixel rectangle anywhere on the displayed screen area when the content is viewed at 1024 by 768 pixels.There are no more than three general flashes and no more than three red flashes within any one-second period, or.In general, web or computer content will not provoke seizures if either of the following is true: These guidelines include restrictions related to frequency, luminance, area and color of any flashing. The Web Content Accessibility Guidelines 2.0 provides recommendations for using these forms of content safely. Content to consider includes bright and rapid flashes, especially red flash, and some spatial patterns. ![]() To minimize the risk of visually induced seizures, web designers and computer software developers should become familiar with the triggers of photosensitive disorder seizures. As web content becomes more dynamic and media-rich, it is important to prevent similar problems. Hazardous, seizure-inducing content has been inadvertently broadcast on television in the past, causing mass seizures in children. Photosensitive seizures can be provoked by certain types of flashing in web or computer content, including mouse-overs that cause large areas of the screen to rapidly flash on and off repeatedly. ![]() Information About Photosensitive Seizure Disorders.Not all content needs to be evaluated by PEAT, but content that contains video or animation should be evaluated, especially if that content contains flashing or rapid transitions between light and dark background colors. PEAT can help authors determine whether animations or video in their content are likely to cause seizures. The evaluation used by PEAT is based on an analysis engine developed specifically for web and computer applications. The Trace Center’s Photosensitive Epilepsy Analysis Tool (PEAT) is a free, downloadable resource for developers to identify seizure risks in their web content and software.
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