Accessibility

This is a statement of intent and a list of known gaps. It is not a conformance claim. Nobody has audited this site with real assistive technology, so anything below that sounds like a promise is only a description of what the code currently does.

Usable with a keyboard alone. Readable without fighting the contrast. Math and figures that a screen reader can reach, rather than pictures of equations that are invisible to anything but an eye.

The last one is the reason for most of the technical decisions here. A math site that ships equations as images is unusable to a screen reader and unreadable when zoomed, and that is a very easy mistake to make.

Verifiable by reading the built pages:

• Equations are markup, not pictures. Math is rendered by KaTeX, which emits MathML alongside the visual layout and hides the visual copy from assistive technology. The original TeX travels with it. Zooming enlarges real text.
• Figures are SVG drawn from computed values. Labels inside them are real text that scales and can be selected, not baked-in pixels.
• Every figure has a text description. All 379 figure components carry an accessible name, so a screen reader announces what the diagram shows rather than skipping it. Purely decorative icons are hidden from assistive technology instead, so they are not read out as meaningless graphics.
• Quizzes work from the keyboard. Each question is a labelled radio group: arrow keys move between options, Enter or Space selects, and the result is announced through a live region rather than by colour alone.
• A skip-to-content link is the first thing in the tab order on every page.
• Tap targets are 44px in the mobile navigation drawer and the footer links.
• Dark theme by default, light theme available, and the choice is remembered.
• Nothing plays sound on its own. The alma mater is a button in the header, off on every page load, and never resumes by itself.
• Pages declare their language, and headings run in order rather than being chosen for their size.

The honest list, and it is the more useful half of this page:

• Some figures share one description between several panels. Where a figure is a row of two or three small graphs, each panel now carries its own label, but a handful of grouped figures elsewhere still describe the whole group in one sentence rather than each part.
• The descriptions vary in quality. Every figure has one. Some are a full sentence explaining what the diagram shows and why; others are a short phrase that names the picture without teaching what it demonstrates. The short ones need rewriting, and that is a slow job done by hand.
• No reduced-motion handling. Nothing in the stylesheet responds to prefers-reduced-motion yet, so animated and interactive figures ignore that preference.
• Contrast has not been measured. The palette was chosen by eye. It has not been checked against a contrast ratio for every combination, particularly inside figures.
• No screen reader testing. Not with NVDA, JAWS, VoiceOver or anything else. The markup was written to be reachable; that is not the same as confirming it reads well.
• Interactive 3D figures have no non-visual equivalent. Where a lesson leans on one to make its point, that point is currently harder to get at.

This site does not claim to conform to WCAG at any level. Making that claim properly needs testing with real assistive technology and expert review, and neither has happened here. Claiming it without that would be a nicer sentence and a worse one.

If that matters for your institution, take this page as the honest input to your own evaluation rather than as a substitute for it.

Email echoesOTV@gmail.com. Tell me the page and what happened - “the quiz on this lesson will not take my keyboard” is plenty, and your browser and assistive software help if you know them.

Accessibility bugs go in front of new lessons. This is one person working around a job, so the queue is real, but a barrier is not the same as a feature request and it does not sit in the same line.

See also the Privacy Policy and the Terms of Use.