@github/tab-container-element

<tab-container> element

A accessible tab container element with keyboard support. Follows the ARIA best practices guide on tabs.

Installation

$ npm install @github/tab-container-element

Usage

import '@github/tab-container-element'

<tab-container>
  <div role="tablist">
    <button type="button" id="tab-one" role="tab" aria-selected="true">Tab one</button>
    <button type="button" id="tab-two" role="tab" tabindex="-1">Tab two</button>
    <button type="button" id="tab-three" role="tab" tabindex="-1">Tab three</button>
  </div>
  <div role="tabpanel" aria-labelledby="tab-one">
    Panel 1
  </div>
  <div role="tabpanel" aria-labelledby="tab-two" hidden>
    Panel 2
  </div>
  <div role="tabpanel" aria-labelledby="tab-three" hidden>
    Panel 3
  </div>
</tab-container>

Events

• tab-container-change (bubbles, cancelable): fired on <tab-container> before a new tab is selected and visibility is updated. event.detail.relatedTarget is the tab panel that will be selected if the event isn't cancelled.
• tab-container-changed (bubbles): fired on <tab-container> after a new tab is selected and visibility is updated. event.detail.relatedTarget is the newly visible tab panel.

When tab panel contents are controls

When activated, the whole tab panel will receive focus. This may be undesirable, in the case where the tab panel is itself composed of interactive elements, such as an action list or radio buttons.

In those cases, apply data-tab-container-no-tabstop to the tabpanel element.

<tab-container>
  <div role="tablist">
    <button type="button" id="tab-one" role="tab" aria-selected="true">Tab one</button>
    <button type="button" id="tab-two" role="tab" tabindex="-1">Tab two</button>
  </div>
  <div role="tabpanel" aria-labelledby="tab-one" data-tab-container-no-tabstop>
    <ul role="menu" aria-label="Branches">
      <li tabindex="0">branch-one</li>
      <li tabindex="0">branch-two</li>
    </ul>
  </div>
  <div role="tabpanel" aria-labelledby="tab-two" data-tab-container-no-tabstop hidden>
    <ul role="menu" aria-label="Commits">
      <li tabindex="0">Commit One</li>
      <li tabindex="0">Commit Two</li>
    </ul>
  </div>
</tab-container>

Browser support

Browsers without native custom element support require a polyfill.

• Chrome
• Firefox
• Safari
• Microsoft Edge

Development

npm install
npm test

License

Distributed under the MIT license. See LICENSE for details.