Accessibility

• The site aims to meet the Web Content Accessibility Guidelines (WCAG) 2.2 at level AA.
• Everything works with a keyboard alone, and focus is always visible.
• Text and controls meet contrast requirements in both the light and dark themes.
• Pages respect your system's reduced-motion and colour-scheme settings.
• Diagrams and tables have text equivalents. Tables are real tables with captions and headers.
• The site has no autoplaying media and no time limits.
• This site uses Cloudflare Web Analytics to count visits. It doesn't use cookies or collect personal information.

Checked in November 2026 with:

• automated testing with axe-core, using its WCAG 2 A, AA and AAA rules, on every page in the daytime and night-time themes
• text contrast measured against the actual rendered background on every page, at four times of the Sydney day and at phone and desktop widths
• every link and control measured at 44 by 44 pixels or larger
• every page checked for horizontal scrolling at 320 pixels wide and at 200% zoom
• the settings, quick-jump, micro-lesson and interactive diagrams operated with the keyboard alone
• every page checked with reduced motion turned on, through the system setting and the site’s own switch
• every page checked with JavaScript turned off
• Lighthouse accessibility audits on the main page types

The site meets WCAG 2.1 at level AA, plus these AAA criteria:

• 1.4.6 Contrast (Enhanced)
• 1.4.8 Visual Presentation
• 1.4.9 Images of Text (No Exception)
• 2.2.3 No Timing
• 2.3.3 Animation from Interactions
• 2.4.8 Location
• 2.4.9 Link Purpose (Link Only)
• 2.4.10 Section Headings
• 2.5.5 Target Size
• 3.1.4 Abbreviations

If something doesn't work for you, please email dulitham@outlook.com and tell me the page and what happened. I'll fix it.