fix: preserve Windows drive letter in buffer for path state

Author: mertcanaltin

url.bs

@@ -3,11 +3,10 @@ Group: WHATWG
 H1: URL
 Shortname: url
 Text Macro: TWITTER urlstandard
-Text Macro: LATESTRD 2025-08
+Text Macro: LATESTRD 2025-02
 Abstract: The URL Standard defines URLs, domains, IP addresses, the <code>application/x-www-form-urlencoded</code> format, and their API.
 Translation: ja https://triple-underscore.github.io/URL-ja.html
 Translation: zh-Hans https://htmlspecs.com/url/
-Translation: ko https://ko.htmlspecs.com/url/
 Required IDs: application/x-www-form-urlencoded,urlencoded-parsing
 </pre>
 
@@ -2248,6 +2247,21 @@ and then runs these steps:
      <li><p>If <a>c</a> is an <a>ASCII alphanumeric</a>, U+002B (+), U+002D (-), or U+002E (.),
      append <a>c</a>, <a lt="ASCII lowercase">lowercased</a>, to <var>buffer</var>.
 
+     <li>
+      <p>Otherwise, if <a>c</a> is U+003A (:), <var>buffer</var>'s <a for=string>length</a> is 1,
+      <var>buffer</var> contains only an <a>ASCII alpha</a>, and <a>remaining</a> starts with
+      U+005C (\):
+
+      <ol>
+       <li><p>Set <var>url</var>'s <a for=url>scheme</a> to "<code>file</code>".
+
+       <li><p>Set <var>url</var>'s <a for=url>host</a> to the empty string.
+
+       <li><p>Set <var>buffer</var> to <var>buffer</var>, followed by U+003A (:).
+
+       <li><p>Set <var>state</var> to <a>path state</a>.
+      </ol>
+
      <li>
       <p>Otherwise, if <a>c</a> is U+003A (:), then: