Meta: point out event's timeStamp is likely to change

See #23 for details.

dom.bs

@@ -804,6 +804,9 @@ initialized to the number of milliseconds that have passed since
 00:00:00 UTC on 1 January 1970, ignoring leap seconds.
 <!-- leap seconds are ignored by JavaScript too -->
 
+<p class=XXX>This is highly likely to change and already does not reflect implementations well.
+Please see <a href=https://github.com/whatwg/dom/issues/23>dom #23</a> for more details.
+
 <hr>
 
 To <dfn export for=Event id=concept-event-initialize>initialize</dfn> an

dom.html

@@ -612,6 +612,8 @@ <h3 class="heading settled" data-level="3.2" id="interface-event"><span class="s
 must return the value it was initialized to. When an <a data-link-type="dfn" href="#concept-event">event</a> is created the attribute must be
 initialized to the number of milliseconds that have passed since
 00:00:00 UTC on 1 January 1970, ignoring leap seconds.</p>
+   <p class="XXX">This is highly likely to change and already does not reflect implementations well.
+Please see <a href="https://github.com/whatwg/dom/issues/23">dom #23</a> for more details. </p>
    <hr>
    <p>To <dfn data-dfn-for="Event" data-dfn-type="dfn" data-export="" id="concept-event-initialize">initialize<a class="self-link" href="#concept-event-initialize"></a></dfn> an <var>event</var>, with <var>type</var>, <var>bubbles</var>, and <var>cancelable</var>, run these steps:</p>
    <ol>