Add the type attribute to style tag on feature matrix page as per HTML standard.

templates/featurematrix/featurematrix.html

@@ -1,7 +1,7 @@
 {%extends "base/page.html"%}
 {%block title%}Feature Matrix{%endblock%}
 {%block extrahead%}
-<style>
+<style type="text/css">
 td.fm_no { background-color: #ffdddd !important; }
 td.fm_yes {  background-color: #ddffdd !important; }
 td.fm_obs { background-color: #ddddff !important; }