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docs(material/button-toggle): update a11y section #20183

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Aug 5, 2020
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docs(material/button-toggle): update a11y section #20183

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5 changes: 3 additions & 2 deletions src/material/button-toggle/button-toggle.md
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Expand Up @@ -23,8 +23,9 @@ be configured globally using the `MAT_BUTTON_TOGGLE_DEFAULT_OPTIONS` injection t
<!-- example(button-toggle-appearance) -->

### Accessibility
The button-toggles will present themselves as either checkboxes or radio-buttons based on the
presence of the `multiple` attribute.
The button-toggles internally use native `button` elements with `aria-pressed` to convey
their toggled state. The button-toggle-group surrounding the individual buttons applies
`role="group"` to convey the association between the individual toggles.

For button toggles containing only icons, each button toggle should be given a meaningful label via
`aria-label` or `aria-labelledby`.
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