[giow] (2) Setting document.domain has to make localStorage unusable …

…because otherwise you can cause deadlocks with per-origin localStorage locks

git-svn-id: http://svn.whatwg.org/webapps@3878 340c8d12-0b0e-0410-8428-c7bf67bfef74

source

  access that data is running.</p>

  <p>When the <code title="dom-localStorage">localStorage</code>
  attribute is accessed, the user agent must check to see if it has
  allocated a local storage area for the <span>origin</span> of the
  <code>Document</code> of the <code>Window</code> object on which the
  method was invoked. If it has not, a new storage area for that
  <span>origin</span> must be created.</p>

  <p>The user agent must then return the <code>Storage</code> object
  associated with that origin's local storage area. Each
  <code>Document</code> object must have a separate object for its
  <code>Window</code>'s <code
  title="dom-localStorage">localStorage</code> attribute.</p>
  attribute is accessed, the user agent must run the following steps:</p>

  <ol>

   <li><p>If the <code>Document</code>'s <span>effective script
   origin</span> is not the <span>same origin</span> as the
   <code>Document</code>'s <span>origin</span>, then throw a
   <code>SECURITY_ERR</code> exception and abort these steps.</p></li>

   <li><p>Check to see if the user agent has allocated a local storage
   area for the <span>origin</span> of the <code>Document</code> of
   the <code>Window</code> object on which the method was invoked. If
   it has not, create a new storage area for that
   <span>origin</span>.</p></li>

   <li><p>Return the <code>Storage</code> object associated with that
   origin's local storage area. Each <code>Document</code> object must
   have a separate object for its <code>Window</code>'s <code
   title="dom-localStorage">localStorage</code> attribute.</p>

  </ol>

  <p id="localStorageEvent">When the <code
  title="dom-Storage-setItem">setItem()</code>, <code