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Use cached select in selectedness setting algorithm #12083

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Use cached select in selectedness setting algorithm #12083

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Use cached select in selectedness setting algorithm
josepharhar Jan 13, 2026
af049b7
readability improvements
josepharhar Jan 15, 2026
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36 changes: 28 additions & 8 deletions source
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Original file line number Diff line number Diff line change
Expand Up @@ -56317,14 +56317,34 @@ interface <dfn interface>HTMLSelectElement</dfn> : <span>HTMLElement</span> {
<span>tree order</span> that is not <span data-x="concept-option-disabled">disabled</span>,
if any, to true, and return.</p></li>

<li><p>If <var>element</var>'s <code data-x="attr-select-multiple">multiple</code> attribute is
absent, and two or more <code>option</code> elements in <var>element</var>'s <span
data-x="concept-select-option-list">list of options</span> have their <span
data-x="concept-option-selectedness">selectedness</span> set to true, then set the <span
data-x="concept-option-selectedness">selectedness</span> of all but the last <code>option</code>
element with its <span data-x="concept-option-selectedness">selectedness</span> set to true in
the <span data-x="concept-select-option-list">list of options</span> in <span>tree order</span>
to false.</p></li>
<li>
<p>If <var>element</var> has the <code data-x="attr-select-multiple">multiple</code> attribute,
then return.</p>

<li><p>Let <var>lastSeen</var> be false.</p></li>

<li>
<p>For each <var>option</var> in <var>element</var>'s <span
data-x="concept-select-option-list">list of options</span> in reverse order:</p>

<ol>
<li>
<p>If <var>option</var>'s <span data-x="concept-option-selectedness">selectedness</span>
is true:</p>

<ol>
<li><p>If <var>option</var>'s <span>cached nearest ancestor <code>select</code>
element</span> is null, then <span>continue</span>.</p></li>

<li><p>If <var>lastSeen</var> is false, then set <var>lastSeen</var> to true and
<span>continue</span>.</p></li>

<li><p>Set <var>option</var>'s <span
data-x="concept-option-selectedness">selectedness</span> to false.</p></li>
</ol>
</li>
</ol>
</li>
</ol>
</div>

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