Commit fb322c9

Authors SHOULD ensure that all interactive [=elements=] are <a>focusable</a> and that all parts of composite widgets are either focusable or have a documented alternative method to achieve

their function.

</p>

<ul>

<li><rref>grid</rref></li>

<li><rref>listbox</rref></li>

<rref>rowgroup</rref>, or <code>grid</code>.

</p>

<p>

the <code>grid</code> content with a keyboard, authors SHOULD set focus as follows:

</p>

<ul>

elements whose <a>role</a> is <rref>group</rref> which in turn contain children whose <a>role</a> is <rref>option</rref>.

</p>

<p>

<a href="#managingfocus">Managing Focus</a>.

</p>

<p>Elements with the role <code>listbox</code> have an implicit <pref>aria-orientation</pref> value of <code>vertical</code>.</p>

The <code>menu</code> <a>role</a> is appropriate when a set of menu items is presented in a manner similar to a popup menu. For instance, a menu could be used to represent a context menu

for its invoking element, or it would be used to render sub-menus for items of a <rref>menubar</rref> or another <code>menu</code> popup.

</p>

<p>Elements with the role <code>menu</code> have an implicit <pref>aria-orientation</pref> value of <code>vertical</code>.</p>

</div>

<table class="def">

The <code>menubar</code> <a>role</a> is used to create a menu bar similar to those found in Windows, Mac, and Gnome desktop applications. A menu bar is used to create a consistent set of

frequently used commands. Authors SHOULD ensure that <code>menubar</code> interaction is similar to the typical menu bar interaction in a desktop graphical user interface.

</p>

<p>Elements with the role <code>menubar</code> have an implicit <pref>aria-orientation</pref> value of <code>horizontal</code>.</p>

</div>

<table class="def">

<rdef>tablist</rdef>

<div class="role-description">

<p>A list of <rref>tab</rref> [=elements=], which are references to <rref>tabpanel</rref> elements.</p>

<!-- keep following para synced with its counterpart in #tab -->

<p>

<rdef>tree</rdef>

<div class="role-description">

<p>A <rref>widget</rref> that allows the user to select one or more items from a hierarchically organized collection.</p>

<p>Elements with the role <code>tree</code> have an implicit <pref>aria-orientation</pref> value of <code>vertical</code>.</p>

</div>

<table class="def">

<pref>aria-readonly</pref> to <code>true</code> on the <rref>gridcell</rref> element. However, if a <code>treegrid</code> presents a collection of elements that do not support

<pref>aria-readonly</pref>, such as a collection of <rref>link</rref> elements, it is not necessary for the author to specify a value for <pref>aria-readonly</pref>.

</p>

</div>

<table class="def">

<caption>