Accessibility statement

Our standard

We aim to meet the Web Content Accessibility Guidelines (WCAG) 2.2 at level AA. This statement was written in November 2026.

What we've done

• Text is real text, not images of text, and meets WCAG contrast requirements.
• Every page has a "Skip to content" link and works with a keyboard alone, with a visible focus outline.
• Pages work on phones, tablets and desktops without sideways scrolling, and at 200% zoom.
• Our pages need no JavaScript, so they work with scripts turned off.
• Pages follow your device's light or dark setting.
• Our pages set no advertising or tracking cookies and show no pop-ups. Our network provider, Cloudflare, may set a short-lived security cookie to screen out automated traffic.

Known limitations

We have not yet completed a full review with screen readers. We do check every page automatically for contrast, headings and broken links, and we test layouts at screen widths from 320 to 1440 pixels.

Tell us about a problem

If something on this site is hard to use, please tell us. Email [email protected] or call 703-763-2840, and we'll fix it or get you the information another way.