Our target
We are working toward conformance with the Web Content Accessibility Guidelines (WCAG) 2.2 at Level AA. This statement describes how the site has been built to meet that target. It is not a claim of certified conformance: an independent audit has not yet been completed, and we will update this page when one has.
How the site is built
- Keyboard access. Every link, menu, form and control can be reached and operated with a keyboard, and the element in focus is always visibly outlined.
- Skip link. The first item on every page lets you skip directly to the main content.
- Structure. Pages use semantic HTML with one main heading, ordered subheadings, landmarks and labeled navigation, so screen readers can move through them predictably.
- Reduced motion. If your device is set to reduce motion, the site presents a static version. Scroll sequences, animated lines, page transitions and the custom pointer are all turned off, and every piece of content remains visible.
- No dependence on motion sensors. Some effects can respond to device movement. None of them is required to read or use the site.
- Works without JavaScript. Navigation, content and forms function with scripting disabled.
- Color and contrast. Text is set against dark backgrounds at contrast ratios that meet or exceed Level AA. Color is never the only way information is conveyed.
- Images. Meaningful images have text alternatives. Decorative graphics are hidden from assistive technology.
- Forms. Every field has a visible label. Errors are described in text, placed next to the field and announced to screen readers.
- Sound. The site never plays sound automatically. Optional sound must be turned on by you.
- Text size. Content can be zoomed to 200 percent and reflows without loss of information.
Known limitations
- Canvas-based visualizations are decorative or illustrative. The information they convey is also given in adjacent text.
- Documents in the materials center are provided by their authors and may not all be fully accessible. Ask us for an alternative format if you need one.
Tell us about a barrier
If you have difficulty using any part of this website, please tell us. Describe the page, what you were trying to do and the technology you were using. We treat accessibility reports as defects to be fixed.
Last updated October 7, 2026