Mon 21 Jul 22:43:21 CEST 2025

js/ui/chart/docs/general/accessibility.md

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+# Accessible Charts
+
+Chart.js charts are rendered on user provided `canvas` elements. Thus, it is up to the user to create the `canvas` element in a way that is accessible. The `canvas` element has support in all browsers and will render on screen but the `canvas` content will not be accessible to screen readers.
+
+With `canvas`, the accessibility has to be added with ARIA attributes on the `canvas` element or added using internal fallback content placed within the opening and closing canvas tags.
+
+This [website](http://pauljadam.com/demos/canvas.html) has a more detailed explanation of `canvas` accessibility as well as in depth examples.
+
+## Examples
+
+These are some examples of **accessible** `canvas` elements.
+
+By setting the `role` and `aria-label`, this `canvas` now has an accessible name.
+
+```html
+<canvas id="goodCanvas1" width="400" height="100" aria-label="Hello ARIA World" role="img"></canvas>
+```
+
+This `canvas` element has a text alternative via fallback content.
+
+```html
+<canvas id="okCanvas2" width="400" height="100">
+    <p>Hello Fallback World</p>
+</canvas>
+```
+
+These are some bad examples of **inaccessible** `canvas` elements.
+
+This `canvas` element does not have an accessible name or role.
+
+```html
+<canvas id="badCanvas1" width="400" height="100"></canvas>
+```
+
+This `canvas` element has inaccessible fallback content.
+
+```html
+<canvas id="badCanvas2" width="400" height="100">Your browser does not support the canvas element.</canvas>
+```