<dt><dfn>focus</dfn>

<dd>

The focus is moved to the nearest focusable element within the [=scroll container=],

The focus is moved to the nearest focusable element within the [=scroll container=]

if it [=can be manually scrolled=] in that direction,

regardless of whether it is visible.

If there are none,

If there are none

or it can't be scrolled in that direction,

the scroll container is <em>not</em> scrolled,

and the search continues up the ancestry chain instead.

If the currently focused element is not itself a [=scroll container=],

this value on an ancestor [=scroll container=] has the same effect as ''spatial-navigation-action/auto''.

If the currently focused element is a [=scroll container=],

If the currently focused element is a [=scroll container=]

and [=can be manually scrolled=] in the direction requested,

it is scrolled in the direction requested without changing which element is in focus,

regardless of the presence of focusable descendants.

Issue(w3c/csswg-drafts#2322): Terminology like this should be in [[CSSOM-VIEW-1]], [[CSS-OVERFLOW-3]], [[CSS-SCROLL-SNAP-1]].

An element <var>e</var> <dfn lt="can be manually scrolled | can be scrolled manually | cannot be scrolled manually | cannot be manually scrolled">can be manually scrolled</dfn> in a given direction <var>d</var> if:

* The <a>principal box</a> established by <var>e</var> is a <a>scroll container</a>, and

* The <a>principal box</a> established by <var>e</var> is a <a>scroll container</a> in |d|'s axis, and

* if <var>d</var> is <code>up</code> or <code>down</code>, the computed value of the 'overflow-y' property is not ''overflow/hidden'', and

* if <var>d</var> is <code>left</code> or <code>right</code>, the computed value of the 'overflow-x' property is not ''overflow/hidden'', and

* <var>e</var> is not at the <a>scroll boundary</a> in the direction <var>d</var>