Cookie infrastructure includes deletion

Author: bvandersloot-mozilla

fetch.bs

@@ -4344,6 +4344,11 @@ given a <a for=/>request</a> <var>request</var>, run these steps:
 </ol>
 </div>
 
+<h3 id=cookie-infrastructure>Cookie Infrastructure</h3>
+
+These algorithms are not only for use with the `<code>Cookie</code>` header, and are used in other
+specifications.
+
 <div algorithm>
 <p>To <dfn>determine the same-site mode</dfn> for a given <a for=/>request</a> <var>request</var>,
 run these steps:
@@ -4364,7 +4369,19 @@ run these steps:
  <li><p>If <var>request</var>'s <a for=request>redirect-taint</a> is "<code>cross-site</code>",
  return "<code>UnsetOrLess</code>".
 
- <li><p>Return "StrictOrLess".
+ <li><p>Return "<code>StrictOrLess</code>".
+</ol>
+</div>
+
+<div algorithm>
+<p> To <dfn>clear site cookies</dfn> for <a for=/>origin</a> <var>origin</var>, run these steps:
+
+<ol>
+ <li><p>Remove all cookies that were stored with a host is either equal to |origin|'s <a for=url>host</a>,
+ or have a <a>registrable domain</a> equal to |origin|'s <a for=url>host</a>'s <a>registrable domain</a>.
+
+ <p class=XXX>The cookie specification doesn't yet have a way to do this algorithmically, so we
+ settle for this definition.
 </ol>
 </div>