cmark

diff --git a/Makefile b/Makefile
@@ -93,7 +93,8 @@ _site/spec.html: spec.txt
 	(echo "% CommonMark Spec\n";\
 	for vers in $(shell cd _site; ls -d -t 0.*) ; do \
 	  date=`stat -t "%Y-%m-%d" -f "%Sa" _site/$$vers/index.html`; \
-	  echo "- [Version $$vers ($$date)](/$$vers/)" ; done) | \
+	  echo "- [Version $$vers ($$date)](/$$vers/)" ; \
+	  perl -pe 's/<div id="watermark"><\/div>/<div id="watermark">This is an older version of the spec. For the most recent version, see <a href="http:\/\/spec.commonmark.org">http:\/\/spec.commonmark.org<\/a>.<\/div>/' _site/$$vers/index.html; \ done) | \
 	pandoc --template template.html -S -s -t html5 -o $@
 
 _site/index.html: _site/spec.html

diff --git a/template.html b/template.html
@@ -46,6 +46,19 @@ pre.html { background-color: #C9CaCE; }
 pre.html span.space:after {
   border: 1px solid #666;
 }
+#watermark {
+ position:fixed;
+ bottom:0px;
+ left:0px;
+ padding: 1em;
+ width: 100%;
+ font-size: 120%;
+ opacity:0.7;
+ z-index:99;
+ background-color: black;
+ color: white;
+}
+#watermark a { color: white; }
 div.examplenum { font-size: 82%; text-align: left; }
 a.dingus { color: red; }
 a.footnoteRef > sup:before {
@@ -87,6 +100,7 @@ $for(author)$<span class="author">$author$</span>$sep$; $endfor$
 <div id="TOC">
 $toc$
 </div>
+<div id="watermark"></div>
 $body$
 </body>
 </html>