This is an official ODERSA website. Here’s how you know

The official domain

The address of this site ends in odersa.org. Every service the association runs sits on a subdomain of odersa.org and nowhere else. If the address in your browser’s address bar does not end in odersa.org, this site is not ours.

Free, and no account

Everything is open straight away. No sign-up, no account, no password, no subscription, no advertising. Nothing is held back for those who pay, because there is nothing to pay for.

No data collected

This site does not follow you: no tracker, no tracking cookie, no measurement tool built into these pages, and nothing measured on your device. Our host counts requests in aggregate, as any server that answers does: a total, never a profile. You do not have to take our word for it: open your browser’s developer tools, go to the Network tab, and reload the page. You will see the full list of what the site asks for. Everything comes from odersa.org, nothing goes anywhere else.

Free to reuse

The content is published under the CC BY 4.0 licence. You may copy it, translate it, print it and pass it on, for your classes as much as for the people around you, on one condition only: credit ODERSA.

Organisation pour le Développement de l’Éducation, des Ressources et des Savoirs AccessiblesNonprofit association · France

Accessibility

A site built to be read by everyone

This site’s accessibility does not rest on good intentions: it is built in, checked at every publication, and something you can verify yourself. This page states what is in place, how to test it, and what we know about its limits.

Statement issued on 27 July 2026 · Target standard: WCAG 2.1, level AA

What is in place

What is in place

Contrast
Every color pair in the style guide is calculated individually against the WCAG AA standard, at every publication. The check is blocking: if a single pair fails, the site does not get published.
Keyboard
The whole site can be navigated by keyboard: a skip link at the top of the page, focus always visible, menus usable by tabbing through, panels and windows that close with Escape.
Readability
Text at 16 pixels minimum, limited line length, a strict heading hierarchy, and settings to enlarge the text (A+, A++) or increase the spacing.
Audio
Every page can be read aloud by your browser’s speech synthesis, from the Settings panel. No external service: the voice is the one already on your device.
Images
Every image carries a text alternative.
Motion
No decorative animation. Your system’s “reduce motion” preference is respected, and a setting in the panel lets you force it.
No JavaScript required
All the content stays readable without JavaScript: navigation unfolds, questions expand.

Settings within reach, on every page

The “Settings” button, on the edge of every page, opens a panel: light or dark theme, text size, increased spacing, high contrast, reduced animations, a stripped-down reading mode, underlined links, audio reading. Your choices are saved in your browser, on your device, and nowhere else: one button clears them all.

Test it yourself, in two minutes

  1. Press Tab from the top of a page: the first link is “Skip to content”, and the focus stays visible at every step.
  2. Open the Settings panel: switch the text to A++, turn on high contrast, then reading mode.
  3. Start audio reading from the panel: the page reads itself aloud.
  4. Zoom to 200% in your browser: the layout adjusts, nothing overlaps.

The limits we know about

  • Audio reading uses the voices installed on your device: their quality and the languages available vary from one browser to another.
  • Captions placed over photos rely on a dark overlay calculated for the worst case; the actual rendering can vary by screen, and the same information stays available in the text of the pages.
  • This statement rests on our own internal checks, described above. Every outside report is one more check on our work: it gets reviewed, and the correction gets published.

Hit a barrier? Tell us

If a page resists your screen reader, your keyboard, or your eyes, write to us with the page and the problem you ran into. We fix it, and the correction is public.

Report a barrier

Keyboard shortcuts

TabMove from link to link
EnterOpen the link, or expand and collapse a question
?Open this help
EscClose the panel or this help