Editorial: export storage key

And slightly modernize associated algorithms and annotate them as well.

Author: annevk

storage.bs

@@ -206,14 +206,15 @@ anticipated that some APIs will be applicable to both <a>storage types</a> going
 
 <h3 id=storage-keys>Storage keys</h3>
 
-<p>A <dfn>storage key</dfn> is a <a>tuple</a> consisting of an <dfn for="storage key">origin</dfn>
-(an <a for=/>origin</a>). [[!HTML]]
+<p>A <dfn export>storage key</dfn> is a <a>tuple</a> consisting of an
+<dfn for="storage key">origin</dfn> (an <a for=/>origin</a>). [[!HTML]]
 
 <p class=XXX>This is expected to change; see
 <a href="https://privacycg.github.io/storage-partitioning/">Client-Side Storage Partitioning</a>.
 
+<div algorithm>
 <p>To <dfn export>obtain a storage key</dfn>, given an <a for=/>environment</a>
-<var>environment</var>, run these steps:
+<var>environment</var>:
 
 <ol>
  <li><p>Let <var>key</var> be the result of running
@@ -226,9 +227,11 @@ anticipated that some APIs will be applicable to both <a>storage types</a> going
 
  <li><p>Return <var>key</var>.
 </ol>
+</div>
 
+<div algorithm>
 <p>To <dfn export>obtain a storage key for non-storage purposes</dfn>, given an
-<a for=/>environment</a> <var>environment</var>, run these steps:
+<a for=/>environment</a> <var>environment</var>:
 
 <ol>
  <li><p>Let <var>origin</var> be <var>environment</var>'s
@@ -238,17 +241,19 @@ anticipated that some APIs will be applicable to both <a>storage types</a> going
 
  <li><p>Return a <a>tuple</a> consisting of <var>origin</var>.
 </ol>
+</div>
 
+<div algorithm>
 <p>To determine whether a <a>storage key</a> <var>A</var>
-<dfn export for="storage key" lt=equal>equals</dfn> <a>storage key</a> <var>B</var>, run these
-steps:
+<dfn export for="storage key" lt=equal>equals</dfn> <a>storage key</a> <var>B</var>:
 
 <ol>
  <li><p>If <var>A</var>'s <a for="storage key">origin</a> is not <a>same origin</a> with
  <var>B</var>'s <a for="storage key">origin</a>, then return false.
 
  <li><p>Return true.
 </ol>
+</div>
 
 
 <h3 id=storage-sheds>Storage sheds</h3>
@@ -472,7 +477,7 @@ is needed for <a href="https://github.com/whatwg/storage/issues/4">issue #4</a>
 <a href="https://privacycg.github.io/storage-access/">Storage Access API</a>.
 
 
-<h3 id=storage-task-source>Storage task source</h2>
+<h3 id=storage-task-source>Storage task source</h3>
 
 <p>The <dfn export id=task-source>storage task source</dfn> is a <a for=/>task source</a> to be used
 for all <a for=/>tasks</a> related to a <a>storage endpoint</a>. In particular those that relate to