diff --git a/source b/source
index e6c462593cb..c7b3b3e9340 100644
--- a/source
+++ b/source
@@ -56241,24 +56241,45 @@ interface <dfn interface>HTMLSelectElement</dfn> : <span>HTMLElement</span> {
   <var>element</var>, is to run the following steps:</p>
 
   <ol>
-   <li><p>If <var>element</var>'s <code data-x="attr-select-multiple">multiple</code> attribute is
-   absent, and <var>element</var>'s <span data-x="concept-select-size">display size</span> is 1,
-   and no <code>option</code> elements in the <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 the first <code>option</code>
-   element in the <span data-x="concept-select-option-list">list of options</span> in
-   <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>Let <var>updateSelectedcontent</var> be false.</p></li>
+
+   <li>
+    <p>If <var>element</var>'s <code data-x="attr-select-multiple">multiple</code> attribute is
+    absent, and <var>element</var>'s <span data-x="concept-select-size">display size</span> is 1,
+    and no <code>option</code> elements in the <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:</p>
+
+    <ol>
+     <li><p>Set the <span
+     data-x="concept-option-selectedness">selectedness</span> of the first <code>option</code>
+     element in the <span data-x="concept-select-option-list">list of options</span> in
+     <span>tree order</span> that is not <span data-x="concept-option-disabled">disabled</span>,
+     if any, to true.</p></li>
+
+     <li><p>Set <var>updateSelectedcontent</var> to true.</p></li>
+    </ol>
+   </li>
+
+   <li>
+    <p>Otherwise, 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:</p>
+
+    <ol>
+     <li><p>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>Set <var>updateSelectedcontent</var> to true.</p></li>
+    </ol>
+   </li>
+
+   <li><p>If <var>updateSelectedcontent</var> is true, then run <span>update a <code>select</code>'s
+   <code>selectedcontent</code></span> given <var>element</var>.</p></li>
   </ol>
   </div>