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feat(labs): add aria accordion component - #6080
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This CL adds a new `<md-aria-accordion>` component, which implements the [accordion](https://www.w3.org/WAI/ARIA/apg/patterns/accordion/) and [disclosure](https://www.w3.org/WAI/ARIA/apg/patterns/disclosure/) design patterns. Both patterns toggle content visibility using an element with role `button` and manage its `aria-expanded` and `aria-controls` attributes, but the accordion pattern expects the button to be wrapped in a heading, which can be optionally specified using this component's `headingLevel` property. This element also follows conventions from `<details>`: the `open` property can be used to get or change the open state, the element dispatches a `toggle` event when opened or closed by the user, and the `name` property can be used to assign many accordion sections in the same tree to an exclusive group. PiperOrigin-RevId: 994660525
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feat(labs): add aria accordion component
This CL adds a new
<md-aria-accordion>component, which implements theaccordion and
disclosure design
patterns. Both patterns toggle content visibility using an element with role
buttonand manage itsaria-expandedandaria-controlsattributes, but theaccordion pattern expects the button to be wrapped in a heading, which can be
optionally specified using this component's
headingLevelproperty.This element also follows conventions from
<details>: theopenproperty canbe used to get or change the open state, the element dispatches a
toggleeventwhen opened or closed by the user, and the
nameproperty can be used to assignmany accordion sections in the same tree to an exclusive group.