Accessibility

• Every video has our own English (UK) captions and a full transcript page, each line linked to its moment.
• Maths is written as MathML alongside its visual form, so screen readers can read equations.
• Every diagram has a text description and a caption.
• The pages work with a keyboard, follow your device's light or dark setting, and print cleanly.

If something is hard to use, please tell us and we will fix it.