Add a "same site" algorithm for sites

Previously we only had one for origins.

source

@@ -84522,8 +84522,9 @@ interface <dfn interface>BarProp</dfn> {
 
   <h4>Sites</h4>
 
-  <p>A <dfn>scheme-and-host</dfn> is a <span>tuple</span> of an <span>ASCII string</span> and a
-  <span data-x="concept-host">host</span>.</p>
+  <p>A <dfn>scheme-and-host</dfn> is a <span>tuple</span> of a <dfn
+  data-x="concept-scheme-and-host-scheme">scheme</dfn> (an <span>ASCII string</span>) and a <dfn
+  data-x="concept-scheme-and-host-host">host</dfn> (a <span data-x="concept-host">host</span>).</p>
 
   <p>A <dfn export>site</dfn> is an <span data-x="concept-origin-opaque">opaque origin</span> or a
   <span>scheme-and-host</span>.</p>
@@ -84546,6 +84547,28 @@ interface <dfn interface>BarProp</dfn> {
    domain</span>).</p></li>
   </ol>
 
+  <p>Two <span data-x="site">sites</span>, <var>A</var> and <var>B</var>, are said to be <dfn
+  export for="site" data-x="concept-site-same-site">same site</dfn> if the following algorithm
+  returns true:</p>
+
+  <ol>
+   <li><p>If <var>A</var> and <var>B</var> are the same <span data-x="concept-origin-opaque">opaque
+   origin</span>, the return true.</p></li>
+
+   <li><p>If <var>A</var> or <var>B</var> is an <span data-x="concept-origin-opaque">opaque
+   origin</span>, then return false.</p></li>
+
+   <li><p>If <var>A</var>'s and <var>B</var>'s <span
+   data-x="concept-scheme-and-host-scheme">scheme</span> values are different, then return
+   false.</p></li>
+
+   <li><p>If <var>A</var>'s and <var>B</var>'s <span
+   data-x="concept-scheme-and-host-host">host</span> values are not <span data-x="host
+   equals">equal</span>, then return false.</p></li>
+
+   <li><p>Return true.</p></li>
+  </ol>
+
   <p>The <dfn export>serialization of a site</dfn> is the string obtained
   by applying the following algorithm to the given <span>site</span> <var>site</var>:</p>
 
@@ -84598,15 +84621,20 @@ interface <dfn interface>BarProp</dfn> {
   </ol>
 
   <p>Two <span data-x="origin">origins</span>, <var>A</var> and <var>B</var>, are said to be <dfn
-  export>same site</dfn> if both of the following statements are true:</p>
+  export>same site</dfn> if the following algorithm returns true:</p>
 
-  <ul>
-   <li><p><var>A</var> and <var>B</var> are <span>schemelessly same site</span></p></li>
+  <ol>
+   <li><p>Let <var>siteA</var> be the result of <span data-x="obtain a site">obtaining a site</span>
+   given <var>A</var>.</p></li>
 
-   <li><p><var>A</var> and <var>B</var> are either both <span data-x="concept-origin-opaque">opaque
-   origins</span>, or both <span data-x="concept-origin-tuple">tuple origins</span> with the same
-   <span data-x="concept-origin-scheme">scheme</span></p></li>
-  </ul>
+   <li><p>Let <var>siteB</var> be the result of <span data-x="obtain a site">obtaining a site</span>
+   given <var>B</var>.</p></li>
+
+   <li><p>If <var>siteA</var> is <span data-x="concept-site-same-site">same site</span> with
+   <var>siteB</var>, then return true.</p></li>
+
+   <li><p>Return false.</p></li>
+  </ol>
 
   </div>