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Add dropdown menu accessibility callout and fix <a> example #22461

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Apr 18, 2017
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Add dropdown menu accessibility callout and fix <a> example #22461

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12 changes: 11 additions & 1 deletion docs/components/dropdowns.md
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Expand Up @@ -16,6 +16,16 @@ Dropdowns are toggleable, contextual overlays for displaying lists of links and

Wrap the dropdown's toggle (your button or link) and the dropdown menu within `.dropdown`, or another element that declares `position: relative;`. Dropdowns can be triggered from `<a>` or `<button>` elements to better fit your potential needs.

{% callout info %}
### Dropdown menu accessibility

The [<abbr title="Web Accessibility Initiative">WAI</abbr> <abbr title="Accessible Rich Internet Applications">ARIA</abbr>](https://www.w3.org/TR/wai-aria/) standard defines an actual [`role="menu"` widget](https://www.w3.org/TR/wai-aria/roles#menu), but this is specific to application-like menus which trigger actions or functions. <abbr title="Accessible Rich Internet Applications">ARIA</abbr> menus can only contain menu items, checkbox menu items, radio button menu items, radio button groups, and sub-menus.

Bootstrap's dropdowns, on the other hand, are designed to be generic and applicable to a variety of situations and markup structures. For instance, it is possible to create dropdowns that contain additional inputs and form controls, such as search fields or login forms. For this reason, Bootstrap does not expect (nor automatically add) any of the `role` and `aria-` attributes required for true <abbr title="Accessible Rich Internet Applications">ARIA</abbr> menus. Authors will have to include these more specific attributes themselves.

However, Bootstrap does add built-in support for most standard keyboard menu interactions, such as the ability to move through individual `.dropdown-item` elements using the cursor keys and close the menu with the <kbd>ESC</kbd> key.
{% endcallout %}

### Single button dropdowns

Any single `.btn` can be turned into a dropdown toggle with some markup changes. Here's how you can put them to work with either `<button>` elements:
Expand All @@ -37,7 +47,7 @@ And with `<a>` elements:

{% example html %}
<div class="dropdown show">
<a class="btn btn-secondary dropdown-toggle" href="https://example.com" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown link
</a>

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