Updates core for HTML validation (again\!)

diff --git a/core b/core
index 067a59f..d0d7d4a 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 067a59f4a5da39a1df635d67c4dab56b3f6d9478
+Subproject commit d0d7d4ade7384d76d6532dcb53d165555e15c1df