Add DOCTYPE declaration to test. No bug. No review.

(Important from W3C test repository, where it was a build fix.)
2013-06-16 10:41:37 -07:00 · 2013-06-16 10:41:37 -07:00 · 3dc74fdc64
--- a/layout/reftests/w3c-css/submitted/flexbox/flexbox-overflow-vert-1-ref.html
+++ b/layout/reftests/w3c-css/submitted/flexbox/flexbox-overflow-vert-1-ref.html
@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/