diff --git a/source b/source
index ca0c9e7e24a..2749e62b429 100644
--- a/source
+++ b/source
@@ -21918,7 +21918,10 @@ interface <dfn>HTMLHyperlinkElementUtils</dfn> {
    data-x="concept-url-scheme">scheme</span> is "<code data-x="">file</code>", terminate these
    steps.</p></li>
 
-   <li><p><span data-x="basic url parser">Basic URL parse</span> the given value, with
+   <li><p>If the given value is the empty string, then set <var>url</var>'s <span
+   data-x="concept-url-port">port</span> to null.</p></li>
+
+   <li><p>Otherwise, <span data-x="basic url parser">basic URL parse</span> the given value, with
    <var>url</var> as <var>url</var> and <span>port state</span> as <var>state
    override</var>.</p></li>
 
@@ -80586,7 +80589,10 @@ State: &lt;OUTPUT NAME=I>1&lt;/OUTPUT> &lt;INPUT VALUE="Increment" TYPE=BUTTON O
    data-x="concept-url-scheme">scheme</span> is "<code data-x="">file</code>", terminate these
    steps.</p></li>
 
-   <li><p><span data-x="basic url parser">Basic URL parse</span> the given value, with
+   <li><p>If the given value is the empty string, then set <var>copyURL</var>'s <span
+   data-x="concept-url-port">port</span> to null.</p></li>
+
+   <li><p>Otherwise, <span data-x="basic url parser">basic URL parse</span> the given value, with
    <var>copyURL</var> as <var>url</var> and <span>port state</span> as <var>state
    override</var>.</p></li>