Added base URL paramter to parse a URL to support base URL

source

@@ -7081,14 +7081,15 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
   injection attacks, while <span>URL parser</span> does not.</p>
 
   <p>To <dfn export>parse a URL</dfn>, given a <span>scalar value string</span> <var>url</var>,
-  relative to a <code>Document</code> object or <span>environment settings object</span>
-  <var>environment</var>,and an optional <span>encoding</span> <var>encoding</var> (default
-  <span>UTF-8</span>), run these steps. They return failure or a <span>URL</span>.</p>
+  with an optional null or <span data-x="document base URL">base URL</span> <var>base</var> (default
+  null), and an optional <span>encoding</span> <var>encoding</var> (default <span>UTF-8</span>), run
+  these steps. They return failure or a <span>URL</span>.</p>
 
   <ol>
-   <li><p>Let <var>baseURL</var> be <var>environment</var>'s <span data-x="document base URL">base
-   URL</span>, if <var>environment</var> is a <code>Document</code> object; otherwise
-   <var>environment</var>'s <span>API base URL</span>.</p></li>
+   <li><p>If <var>base</var> is not null, let <var>baseURL</var> be <var>base</var>. Otherwise, let
+   <var>baseURL</var> be <var>environment</var>'s <span data-x="document base URL">base URL</span>,
+   if <var>environment</var> is a <code>Document</code> object; otherwise <var>environment</var>'s
+   <span>API base URL</span>.</p></li>
 
    <li><p>Let <var>newline</var> and <var>lt</var> flag be false.</p></li>
 
@@ -15010,7 +15011,7 @@ interface <dfn interface>HTMLBaseElement</dfn> : <span>HTMLElement</span> {
    <li><p>Let <var>url</var> be the value of the <code data-x="attr-base-href">href</code>
    attribute of this element, if it has one, and the empty string otherwise.</p></li>
 
-   <li><p>Let <var>urlRecord</var> be the result of <span data-x="URL parser">parsing</span>
+   <li><p>Let <var>urlRecord</var> be the result of <span data-x="parse a URL">parsing</span>
    <var>url</var> with <var>document</var>'s <span>fallback base URL</span>, and
    <var>document</var>'s <span data-x="document's character encoding">character encoding</span>.
    (Thus, the <code>base</code> element isn't affected by other <code>base</code> elements or