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Proposed change for Focus Navigation
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As discussed in
WICG#375

This adds a clarification about focus navigation order for
nodes distributed under a slot element.

Also added handling tabindex="-1" case.
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TakayoshiKochi authored and Takayoshi Kochi committed Mar 18, 2016
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23 changes: 23 additions & 0 deletions spec/shadow/index.html
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Expand Up @@ -1156,6 +1156,8 @@ <h3>Focus Navigation</h3>
<p>The <a>sequential focus navigation order</a> for a given <a>shadow tree</a> <var>A</var> <strong>must</strong> be inserted into the <a>sequential focus navigation order</a> for the <a>parent tree</a> <var>B</var> as follows:</p>
<ol>
<li>Let <var>HOST</var> be the <a>shadow host</a> which <a>hosts</a> A</li>
<li>The <a>sequential focus navigation order</a> for A <strong>must</strong> be
skipped if <var>HOST</var> is given the <a>tabindex</a> value -1.</li>
<li>
The <a>sequential focus navigation order</a> for A <strong>must</strong> be inserted into the <a>sequential focus navigation order</a> for <var>B</var>:
<ol>
Expand All @@ -1165,6 +1167,27 @@ <h3>Focus Navigation</h3>
</li>
</ol>

<p>Likewise, the <a>sequential focus navigation order</a> for <a>distributed nodes</a>
under a given <a>slot</a> <var>A</var> <strong>must</strong> be inserted into
the <a>sequential focus navigation order</a> of the containing <a>shadow tree</a>'s
<a>sequential focus navigation order</a> as follows:</p>
<ol>
<li>The <a>sequential focus navigation order</a> for its <a>distributed nodes</a>
<strong>must</strong> be skipped if A is assigned <a>tabindex</a> value -1.
<li>If <var>A</var> is not given <a>tabindex</a>,
The <a>sequential focus navigation order</a> for its <a>distributed nodes</a>
<strong>must</strong> be inserted in place of <var>A</var> as if <var>A</var>
were assigned the <a>tabindex</a> value 0 for determining its position.</li>
<li>Otherwise the <a>sequential focus navigation order</a> for its
<a>distributed nodes</a> <strong>must</strong> be inserted in place of
<var>A</var> according to its <a>tabindex</a> value.</li>
</ol>
<p class="note">When a <a>slot</a> <var>A</var> is assigned to another
<a>slot</a> <var>B</var>,
the <a>sequential focus navigation order</a> of <var>A</var>'s <a>distributed nodes</a>
is inserted into <var>B</var>'s <a>sequential focus navigation order</a> following
the steps shown above.</p>

<p>For <a>directional focus navigation</a> [[!CSS3-UI]], it is up to the user agent to integrate the <a data-lt="shadow tree">shadow trees</a> into the document's <a>directional focus navigation</a>.
</section>

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